Instead of spending a carefree summer exploring downtown Boston with best friend Ollie, thirteen-year-old Moxie must solve a famous art heist in order to protect those she loves from her ailing grandfather's gangster past. Includes facts about the 1990 Gardner Museum art theft. "Moxie Fleece knows the rules and follows themthat is, until the day she opens her front door to a mysterious stranger. Suddenly Moxie is involved in Boston's biggest unsolved mystery: The Isabella Stewart Gardner Museum art heist. Moxie has two weeks to find the art, otherwise she and the people she loves will be in big-time danger. Her tools? Her best friend, Ollie, a geocaching addict who loves to find stuff; her Alzheimer's suffering grandfather, Grumps, who knows lots more than he lets on; and a geometry proof that she sets up to sort out the clues. It's a race against the clock through downtown Boston as Moxie and Ollie break every rule she's ever lived by to find the art and save her family."--From publisher.