Aldo, a middle-aged adventurer, seeks to make his fortune by working in a gold mine in Canada. One day, the mineworkers are attacked and all but wiped out by a group of armed bandits who intend to steal their gold. Only Aldo and two Canadian Indians survive the massacre, and in return they kill the bandits. The trio decide to run off with the gold. Suspecting his new allies are about to double-cross him, Aldo drives off without them, but he then loses the gold whilst crossing a river. Determined to recover the gold, Aldo returns to his former home in Montreal and tries to persuade his friends to help him. His best friend Gérard, a former motorcar-racing driver who lost the use of his legs in an accident, agrees to give his support, along with his wife, Éléonore and another friend John. Unfortunately, the two Indians whom Aldo betrayed have not given up the gold either…

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