When Alfie McQuinn, the notorious jewel thief, is killed on a job, his last words to his son, March, are to "find jewels," and this instruction leads the boy to Jules, the twin sister he never knew he had--and the perfect partner to carry on the family business.

Twelve-year-old March McQuin forgot rule number one for cat burglars, which is how he and his twin sister, Jules, found themselves dangling upside down twenty feet above a stone floor at three in the morning. Their target was a set of stunning diamonds and it should have been an easy job, in and out. Except another thief got there first. March and Jules were lucky to escape with their lives, and one measly stone.