Void Moon by Michael Connelly

Void Moon traces the path of Cassie Black, a gifted thief who struggles with the temptation of "outlaw juice" (the burning desire to live the fast life of crime and payoffs) even while she regularly attends her probation meetings. It's not that hawking Porsches to newly flush young Hollywood males isn't satisfying, but... well, it isn't. After years away, she returns to her old striking grounds in Las Vegas for one last big mark hoping to pave her way into a new life.