The Rogue You Know by Shana Galen

Since Lady Susanna's brother married Marlowe, a former pickpocket, her invitations to social events haven't dried up completely, but there's a noticeable lack of opportunities. Especially since her mother has clamped down even more. Susanna can't even go to the bathroom alone.
Until the night a man, Gideon Harrow, dives through her window. He's just stolen a necklace that is supposed to get him out of the same gang Marlowe was part of. And now Susanna has it. And she wants adventure in exchange for its return. And adventure she gets, not least because he's run off with the necklace he was supposed to turn over to Beezle (a baddie we saw in the last book) and the necklace's last "owner" is out for his blood as well. 
An okay book. At least "bubbies" were only brought up a couple of times in this one.
Three stars.

Follows: Earls Just Want to have Fun