Beyond Compare — Patricia DeGroot

MORE PRECIOUS THAN ANY JEWEL...
Isabel Marchand had several reasons to wed Jeremy Quinn, the Marquis of Pearl, not the least of which was to retain custody of her orphaned nephews. It didn't matter to her that he had spent the last two years in Marshalsea prison, or that he had never answered one of her letters. What mattered was the trust she longed to earn from him -- and the passionate love she longed to share.

...AND RARER THAN ANY TREASURE
Quinn walked out of his cell to hear that a bride awaited him -- and found himself face to face with his former fiancee. Why was she willing to marry him now? He had no answer to that, and no idea whose cruel scheme had sent him to Marshalsea. Yet vengeance was difficult to consider, when all he could dream of was Isabel's sweet kiss.