Once A Thief by Michele Hauf

Security Consultant, Rachel Anderson, has three big problems.
1. The priceless gem she’s providing security for has disappeared.
2. If anyone looks into her background, they’ll discover she was once a thief.
3. The person who has the gem knows exactly who she is…
Because he’s the man who raised her—and trained her to be a cunning thief. She’d fled and made a new life for herself, determined to use her unique skills for good. But to retrieve the stolen gem and keep everything she’s fought for, she’s got to turn the tables and prove the student is now the master.