Sam, a 22-years-old competitive swimmer who aspires to compete in the Olympic Games, is confronted with a momentous event that forces him to reevaluate his life.

As a dizzying heat wave hits Montreal and throws the city into a state of general torpor, the residents of the Saint-Henri neighborhood fall prey to events that reason cannot explain.

In an abandoned house in a small village, five youngsters discover a secret passage to a mysterious world hiding a priceless treasure. However, the joy brought by this extraordinary discovery will be short-lived for Lou and his friends. Threatened by immoral villains, our young protagonists have no choice but to plunge into this strange world to save themselves and embark on a treasure hunt that push them to their ultimate limit.