Olivier, a student at the Beaux-Arts, sees his dream come true when he leads a group of Japanese tourists as a summer guide. However, the joy turns into a nightmare when a member of the group disappears without a trace. Is it murder or kidnapping? Olivier takes on the role of detective and quickly discovers that the truth isn't easy to uncover. Fortunately, he has Julie by his side, a mysterious and knowledgeable girl. Together, they significantly increase their chances of success!