[worktolive]

Free from Sourcebooks:

The Rogue You Know by Shana Galen.

This is book #2 in a series, but the first book, Earls Just Want to Have Fun, was free back in November so you may have picked it up then.

Spoiler:

She's beyond his reach...
Gideon Harrow has spent his life in London's dark underworld-and he wants out. A thief and a con, he plans one last heist to finally win his freedom. But when everything goes wrong, he finds himself at the tender mercies of one of Society's most untouchable women-Lady Susanna Derring.

...and out of her depth.
Susanna has spent her life in London's glittering ton, under the thumb of a domineering mother-and she wants out. When a wickedly charming rogue lands at her feet, she jumps at the chance to experience life before it's too late. But as she descends into London's underworld, she finds that nothing- not even Gideon-is as it seems. As excitement turns to danger, Susanna must decide what price she's willing to pay...for the love of a reformed thief.