INDEMNIFICATION AGREEMENT

Exhibit 10.12

INDEMNIFICATION AGREEMENT

     THIS INDEMNIFICATION AGREEMENT (“ Agreement ”), is made and entered into this 20th day of March, 2007 (the “ Effective Date ” ) by and between GSC Investment LLC, a Maryland limited liability company (the “ Company ”), and Richard M. Hayden (“ Indemnitee ”).

     WHEREAS, the Company is a newly organized limited liability company that expects to merge (the “ Merger Transaction ”) with and into GSC Investment Corp., a Maryland corporation (the “ Corporation ”) that in turn expects to file an election to be treated as a business development company under the Investment Company Act of 1940, as amended (the “ Investment Company Act ”) and to elect to be taxable as a registered investment company commencing with its taxable year ending December 31, 2007. Unless the context otherwise requires, references to the “Company” included herein shall mean both GSC Investment LLC prior to the closing of the Merger Transaction and GSC Investment Corp. on or after such closing.

     WHEREAS, at the request of the Company, Indemnitee currently serves as a director of the Company; and

     WHEREAS, Indemnitee may be subjected to claims, suits or proceedings arising as a result of his service as a director of the Company; and

     WHEREAS, as an inducement to Indemnitee to continue to serve as a director of the Company, the Company has agreed to indemnify and to advance expenses and costs incurred by Indemnitee in connection with any such claims, suits or proceedings, to the fullest extent permitted by law; and

     WHEREAS, the parties by this Agreement desire to set forth their agreement regarding indemnification and advance of expenses.

     NOW, THEREFORE, in consideration of the premises and the covenants contained herein, the Company and Indemnitee do hereby covenant and agree as follows:

     SECTION 1 . Definitions. For purposes of this Agreement:

     (a) “ Change in Control ” means a change in control of the Company occurring after the Effective Date of a nature that would be required to be reported in response to Item 6(e) of Schedule 14A of Regulation 14A (or in response to any similar item on any similar schedule or form) promulgated under the Securities Exchange Act of 1934, as amended (the “ Act ”), whether or not the Company is then subject to such reporting requirement; provided, however, that,

without limitation, such a Change in Control shall be deemed to have occurred if after the Effective Date (i) any “ person ” (as such term is used in Sections 13(d) and 14(d) of the Act) is or becomes the “ beneficial owner ” (as defined in Rule 13d-3 under the Act), directly or indirectly, of securities of the Company representing 15% or more of the combined voting power of the Company’s then outstanding securities without the prior approval of at least two-thirds of the members of the Board of Directors of the Company in office immediately prior to such person attaining such percentage interest; (ii) there occurs a proxy contest, or the Company is a party to a merger, consolidation, sale of assets, plan of liquidation or other reorganization not approved by at least two-thirds of the members of the Board of Directors of the Company then in office, as a consequence of which members of the Board of Directors of the Company in office immediately prior to such transaction or event constitute less than a majority of the Board of Directors thereafter; or (iii) during any period of two consecutive years, other than as a result of an event described in clause (a)(ii) of this Section 1, individuals who at the beginning of such period constituted the Board of Directors of the Company (including for this purpose any new director whose election or nomination for election by the Company’s stockholders was approved by a vote of at least two-thirds of the directors then still in office who were directors at the beginning of such period) cease for any reason to constitute at least a majority of the Board of Directors of the Company.

     (b) “ Corporate Status ” means the status of a person who is or was a director, trustee, officer, employee or agent of the Company or of any other corporation, partnership, joint venture, trust, employee benefit plan or other enterprise for which such person is or was serving at the request of the Company.

     (c) “ Disinterested Director ” means a director of the Company who is not and was not a party to the Proceeding in respect of which indemnification is sought by Indemnitee.

     (d) “ Effective Date ” has the meaning set forth in the first paragraph of this Agreement.

     (e) “ Expenses ” shall include all reasonable and out-of-pocket attorneys’ fees, retainers, court costs, transcript costs, fees of experts, witness fees, travel expenses, duplicating costs, printing and binding costs, telephone charges, postage, delivery service fees, and all other disbursements or expenses of the types customarily incurred in connection with prosecuting, defending, preparing to prosecute or defend, investigating, or being or preparing to be a witness in a Proceeding.

     (f) “ Independent Counsel ” means a law firm, or a member of a law firm, that is experienced in matters of corporation law and neither is, nor in the past five years has been, retained to represent: (i) the Company or Indemnitee in

any matter material to either such party, or (ii) any other party to or witness in the Proceeding giving rise to a claim for indemnification hereunder. Notwithstanding the foregoing, the term “ Independent Counsel ” shall not include any person who, under the applicable standards of professional conduct then prevailing, would have a conflict of interest in representing either the Company or Indemnitee in an action to determine Indemnitee’s rights under this Agreement. If a Change of Control has not occurred, Independent Counsel shall be selected by the Board of Directors of the Company, with the approval of Indemnitee, which approval will not be unreasonably withheld. If a Change of Control has occurred, Independent Counsel shall be selected by Indemnitee, with the approval of the Board of Directors, which approval will not be unreasonably withheld.

     (g) “ Proceeding ” includes any threatened, pending or completed action, suit, arbitration, alternate dispute resolution mechanism, investigation, administrative hearing or any other proceeding, whether civil, criminal, administrative or investigative (including on appeal), except one pending or completed on or before the Effective Date, unless otherwise specifically agreed in writing by the Company and Indemnitee.

     SECTION 2 . Services By Indemnitee. Indemnitee will serve as a director of the Company. However, this Agreement shall not impose any obligation on Indemnitee or on the Company, to continue Indemnitee’s service to the Company, beyond any period otherwise required by law or by other agreements or commitments of the parties, if any.

     SECTION 3 . Indemnification-General. The Company shall indemnify, and advance Expenses to, Indemnitee (a) as provided in this Agreement and (b) otherwise to the fullest extent permitted by Maryland law in effect on the date hereof and as amended from time to time; provided, however, that no change in Maryland law shall have the effect of reducing the benefits available to Indemnitee hereunder based on Maryland law as in effect on the date hereof. The rights of Indemnitee provided in this Section 3 shall include, without limitation, the rights set forth in the other sections of this Agreement, including any additional indemnification permitted by Section 2-418(g) of the Maryland General Corporation Law (“ MGCL ”).

     SECTION 4 . Proceedings Other Than Proceedings By Or In The Right Of The Company. Indemnitee shall be entitled to the rights of indemnification provided in this Section 4 if, by reason of his Corporate Status, he is, or is threatened to be, made a party to or a witness in any threatened, pending, or completed Proceeding, other than a Proceeding by or in the right of the Company. Pursuant to this Section 4, Indemnitee shall be indemnified against all judgments, penalties, fines and amounts paid in settlement and all Expenses actually and reasonably incurred by him or on his behalf in connection with a Proceeding by reason of his Corporate Status unless it is established that (i) the act or omission

of Indemnitee was material to the matter giving rise to the Proceeding and (a) was committed in bad faith or (b) was the result of active and deliberate dishonesty, (ii) Indemnitee actually received an improper personal benefit in money, property or services, or (iii) in the case of any criminal Proceeding, Indemnitee had reasonable cause to believe that his conduct was unlawful.

     SECTION 5 . Proceedings By Or In The Right Of The Company. Indemnitee shall be entitled to the rights of indemnification provided in this Section 5 if, by reason of his Corporate Status, he is, or is threatened to be, made a party to or a witness in any threatened, pending or completed Proceeding brought by or in the right of the Company to procure a judgment in its favor. Pursuant to this Section 5, Indemnitee shall be indemnified against all amounts paid in settlement and all Expenses actually and reasonably incurred by him or on his behalf in connection with such Proceeding unless it is established that (i) the act or omission of Indemnitee was material to the matter giving rise to such a Proceeding and (a) was committed in bad faith or (b) was the result of active and deliberate dishonesty or (ii) Indemnitee actually received an improper personal benefit in money, property or services.

     SECTION 6 . Court-Ordered Indemnification. Court-Ordered Indemnification. Notwithstanding any other provision of this Agreement, a court of appropriate jurisdiction, upon application of Indemnitee and such notice as the court shall require, may order indemnification in the following circumstances:

     (a) if it determines Indemnitee is entitled to reimbursement under Section 2-418(d)(1) of the MGCL, the court shall order indemnification, in which case Indemnitee shall be entitled to recover the expenses of securing such reimbursement; or

     (b) if it determines that Indemnitee is fairly and reasonably entitled to indemnification in view of all the relevant circumstances, whether or not Indemnitee (i) has met the standards of conduct set forth in Section 2-418(b) of the MGCL or (ii) has been adjudged liable for receipt of an improper personal benefit under Section 2-418(c) of the MGCL, the court may order such indemnification as the court shall deem proper. However, indemnification with respect to any Proceeding by or in the right of the Company or in which liability shall have been adjudged in the circumstances described in Section 2-418(c) of the MGCL shall be limited to Expenses actually and reasonably incurred by him or on his behalf in connection with a Proceeding.

     SECTION 7 . Indemnification For Expenses Of A Party Who Is Wholly Or Partly Successful. Notwithstanding any other provision of this Agreement, and without limiting any such provision, to the extent that Indemnitee is, by reason of his Corporate Status, made a party to and is successful, on the merits or otherwise, in the defense of any Proceeding, he shall be indemnified for all Expenses

actually and reasonably incurred by him or on his behalf in connection therewith. If Indemnitee is not wholly successful in such Proceeding but is successful, on the merits or otherwise, as to one or more but less than all claims, issues or matters in such Proceeding, the Company shall indemnify Indemnitee under this Section 7 for all Expenses actually and reasonably incurred by him or on his behalf in connection with each successfully resolved claim, issue or matter, allocated on a reasonable and proportionate basis. For purposes of this Section and without limitation, the termination of any claim, issue or matter in such a Proceeding by dismissal, with or without prejudice, shall be deemed to be a successful result as to such claim, issue or matter.

     SECTION 8 . Advance Of Expenses. The Company shall advance all reasonable Expenses actually and reasonably incurred by or on behalf of Indemnitee in connection with any Proceeding (other than a Proceeding brought to enforce indemnification under (i) this Agreement, (ii) applicable law, (iii) the Charter or Bylaws of the Company, (iv) any agreement or (v) a resolution of (A) the stockholders entitled to vote generally in the election of directors or (B) the Board of Directors) to which Indemnitee, by reason of his Corporate Status, is, or is threatened to be, made a party or a witness, within ten days after the receipt by the Company of a statement or statements from Indemnitee requesting such advance or advances from time to time, whether prior to or after final disposition of such Proceeding. Such statement or statements shall reasonably evidence the Expenses incurred by Indemnitee and shall include or be preceded or accompanied by a written affirmation by Indemnitee of Indemnitee’s good faith belief that the standard of conduct necessary for indemnification by the Company as authorized by law and by this Agreement has been met and a written undertaking by or on behalf of Indemnitee, in substantially the form attached hereto as Exhibit A or in such form as may be required under applicable law as in effect at the time of the execution thereof, to reimburse the portion of any Expenses advanced to Indemnitee relating to claims, issues or matters in the Proceeding as to which it shall ultimately be established that the standard of conduct has not been met and which have not been successfully resolved as described in Section 7. For so long as the Company is subject to the Investment Company Act, any advancement of Expenses shall be subject to at least one of the following as a condition of the advancement: (a) Indemnitee shall provide a security for his or her undertaking, (b) the Company shall be insured against losses arising by reason of any lawful advances or (c) a majority of a quorum of the Disinterested Directors, or Independent Counsel, in a written opinion, shall determine, based on a review of readily available facts (as opposed to a full-trial-type inquiry), that there is no reason to believe that Indemnitee ultimately will be found to not be entitled to indemnification. To the extent that Expenses advanced to Indemnitee do not relate to a specific claim, issue or matter in the Proceeding, such Expenses shall be allocated on a reasonable and proportionate basis. The undertaking required by this Section 8 shall be an unlimited general obligation by

or on behalf of Indemnitee and shall be accepted without reference