Receiving a call from a man wishing to remain anonymous, the Prud'homme brothers set out to find a certain Léon Laurendeau, a suspected bicycle thief. Is this an ordinary investigation or the beginning of a great adventure?
A certain César Langelier retains the services of the Prud'homme brothers for a ghost story that seems to be rather disjointed. Will the detectives be able to put together the story and discover the inexplicable?
When a group of friends gather at the home of a certain Homer Saint-Homard to celebrate Halloween, the Prud'homme brothers have no idea that an evil force has been waiting to strike. Could the psychopaths César and Léon have a link with this story?