While adhering to the standard Olsen-Twins formula chaste romance, travelogue scenery, oodles of "with-it" fashions this teenybopper frolic compensates for its limitations with humor. Maddie (Mary-Kate Olsen) and Abby (Ashley Olsen) Parker yearn to be popular at school. Instead they find themselves propelled into a national spotlight when they accidentally thwart the Mafia-backed theft of the fabled Kneel Diamond by squirting ketchup on a fleeing bandit, who panics because he thinks he's been shot. What they don't realize is that the crook slipped the bauble into one of their knapsacks. The Parker Twins testify in court, angering Mafia don Emil Hatchew ...