To Steal a Heart (The Bleecker Street Inquiry Agency)

After a childhood as a street thief, Gabriella Goodhue thought she'd put her past behind her until a fellow resident at her boardinghouse is unjustly accused of theft. In the middle of breaking into a safe that holds the proof to prove her friend's innocence, Gabriella is interrupted by Nicholas Quinn, the man she once considered her best friend--until he abandoned her.

After being taken under the wing of a professor who introduced him into society and named him as heir, Nicholas is living far removed from his childhood life of crime. As a favor to a friend, Nicholas agreed to help clear the name of an innocent woman, never imagining he'd be reunited with the girl he thought lost to him forever.

As Gabriella and Nicholas are thrown together into one intrigue after another, their childhood affection grows into more, but their newfound feelings are tested when truths about their past are revealed and danger follows their every step.