Heist Society by Ally Carter

Katarina Bishop thought she had made it clear: she did not want to go into the family business. She wanted a normal life, starting with an education at the Colgan School. But when the headmaster's car is found atop the fountain in the quad, and grainy videotape identifies Kat as the primary suspect, she finds that someone wants her back in the game. And this game? This one is saving her father, who himself is being followed by international police and, more importantly, by Arturo Taccone, who is convinced that Bobby Bishop was behind the theft of a priceless treasure trove of paintings from Taccone's mansion. Kat has 14 days to return the paintings...