Summer 1998. Palavas-les-Flots. While the World Cup is in full swing, Sandrine Laplace, a bumbling contract worker who thinks she's a CIA agent, decides to investigate a mysterious accident that happened on the ghost train at the local fair. Incompetent but reckless, Sandrine infiltrates a brutal world - made up of clan wars, cotton candy and bumper cars - and will have to form an alliance with Carmen and Yvane, two showmen who are completely opposite. What if there was a murderer in the carnival?