The Fiancée Caper (Harlequin Desire Book 2317)

To Catch a Thief, It Will Take a Thief 

He comes from a long line of charismatic jewel thieves. But Gianni Coretti made a deal to save his family and now walks the straight and narrow. When Marie O'Hara, a beautiful security expert, asks him to steal for her as part of a sting, his interest is definitely piqued. The fact that she'll be pretending to be his fiancée is an added bonus. But as their fierce attraction blurs the line between ruse and reality, Gianni has to wonder: does a man with such a dubious past deserve a glorious future with this woman?