Seventeen year-old Gil Leduc returns to France after a four-year absence. He hopes for a quiet vacation on the beaches of Royan, France, a small city along the Atlantic Coast. While on his way there, he meets a suspicious lady on the train and reads about an American student gone missing in the city. Later he stumbles on the student's dead body. He offers to help the police, but is told not to interfere in the investigation. He leads a investigation of his own with the help of his cousin and his girlfriend. This leads him into a deadly cocaine ring. In the process Gil has attempts on his life.