The Blue Island Thief (Thea Stilton #39)

The Thea Sisters are headed to the beautiful island of Capri. They get to try the local pizza, swim with the dolphins, and take a ride on a real sailboat. But during their stay at a hotel full of old-fashioned charm, they come across a mystery. The sisters get to work collecting clues to help solve it. Can they figure out who the blue island thief is before their vacation comes to an end?