O famoso médico Edwardes é o recém contratado diretor de uma clínica para doentes mentais. A Dra. Constance é a psiquiatra do local e percebe que os comportamentos de Edwardes estão bastante estranhos.
The middle aged matron at a Norwich school wins a large prize in a French lottery. She is murdered in London and the murderer's secretary impersonates her and draws the old lady's prize money. There follows a series of killings until the murderer realises that he is trapped and commits suicide.
