When a young English man is convicted of murder and sentenced to hang, his sister and her fiancé, convinced of his innocence, ask visiting detective Charlie Chan to investigate the crime and find the real murderer. In order to solve the mystery, he must visit a lavish country manor house in England where the suspects vary from the housekeeper to a lawyer. Events soon indicate that the murderer is still actively trying to avoid capture, but Charlie Chan must set a trap to reveal the criminal's identity.