In the spring of 1905, the water conduit project in the Canadian city of Canitoga is set to be completed. For years, the completion had been marred by sabotage. Engineer Oliver Montstuart commands the last blasting operation. But again, the explosive charge is too large and thus, further construction is forestalled again. When Montstuart confronts foreman Westbrook, the foreman threatens him with a knife. In self-defence, Montstuart shoots him. Now, he has to flee.
Fernand has escaped from prison and finds shelter in the traveling circus Barlay, where his former wife Flora works as a predator trainer. Their son, now grown up, Marcel is an art rider and does not know that Fernand is his father. Marcel loves Yvonne, the daughter of director Barlay. He is against the connection, sends his daughter to Italy and convinces Marcel that Yvonne does not return his feelings.
A doctor discovers a new medical cure with dangerous side effects, and takes the drug himself to test its limitations.
