Scandalous Wager by Jane Charles

Miss Vanessa Claxton gave her heart to Lord Crispin Tilson when she was only seventeen. He did not ask for it, but it went willingly. A secret friendship on the cusp of young love, and then he was gone.
Lord Crispin Tilson hadn’t expected that at the age of twenty he’d fall in love with a miss enjoying her first Season. He certainly hadn’t anticipated that their meetings would take place in secret and that nobody would ever learn. But, as much as he wished to be with Vanessa, adventure called, and he had to leave her behind.
Nine years later, they meet once again when Lord Crispin, the finder of all things, and Miss Claxton, the thief finder, are asked to locate a missing gem. Will love bloom again, or will competition and wagers get in the way?