An old castle contains hidden treasure. But being guarded by ghosts and demons makes it hard to get.; A professer finds an old flute that, when played, opens a cave in which witches have been entrapped.; Inspector Vidac discovers that mutated beings live in the sewers of Paris and they feed on corpses.; As a joke 2 medical students put a corpse in bed with their sleeping friend. When they go to wake him he is dead and the corpse is alive!