Join Thea Stilton and the Thea Sisters on an adventure packed with mystery and friendship!While on vacation in Greece, the Thea Sisters make friends with a company of actors. They are rehearsing for a show that's about to open -- and Colette ends up standing in for an actress who falls ill! Suddenly, right before the performance, the lead actor goes missing. Can the mouselets find him in time for the show to go on?