During their Spring Break school vacation, twin sisters Melanie and Allison Porter, reluctantly (at first) travel to Paris to visit their Grandpa Edward, the U.S. Ambassador to France. Expecting a great time with their grandfather, they instead end up with his no-nonsense assistant, Jeremy Bluff, chaperoning them. While there, they befriend Brigitte, a beautiful French fashion model (with whom they later set Jeremy up on a date), and fall for two charming French boys named Jean and Michel. The girls find various ways to ditch Jeremy, so they can spend time cruising around the city on mopeds with the boys.