A death occurs at the country estate of a venerable and highly respected British family, and the local constabulary is willing to write off the tragedy as an accident. But amateur detective Gethryn (André Luguet) suspects that the decedent was murdered and sets out to prove it despite opposition from the authorities. Upon discovering the guilty party, the class-conscious Luguet offers him the "gentleman's way out" by suggesting a quick and painless suicide. Heroine Lucy (Annie Vernay) is called upon to widen her eyes in terror but little else.