Officers Joe Merriweather and Katherine Cowles are responsible for discovering the assassin of a young woman found in a bath filled with flowers. But their investigation is trampling because the murderer proves very clever. In desperation, they appeal to John Clancy, a medium that has already successfully helped the police. Katherine Cowles does not appreciate her presence and methods. For her part, Clancy does not like psychology, specialty of the young woman. He sets to work and quickly discovers that the assassin has the same gift as him. His talent is even superior to his because he always has a head start.