The promise of beaches, gondola rides, palaces, and all the pizza they can eat lures fifteen-year-old twins Patrick and Shelby Martin to Italy. Their idyllic trip of a lifetime becomes their worst nightmare when danger stalks them from Venice to Rome. They work with undercover police to determine who is responsible for the stalkings, kidnappings, and accidents. Grams puts her foot down and says they are taking the next plane home. Patrick and Shelby realize they are racing against the clock to solve the mystery.