Donald Mason is a married professor who wants to end a romance with one of his students. He stops by while she is babysitting. He tries to end the relationship, but she threatens to expose him. He kills her and leaves a witness: the screaming baby she was watching. Later, Mason runs into the infant in a carriage on the street. At the sight of him the baby screams and cries. Hau... (展開(kāi)全部)