In an empty London house, a hobo named Ben (Leon M. Lion) looks for shelter yet instead finds a corpse. When Detective Fordyce (John Stuart) shows up, he questions Ben, but is interrupted when a girl (Ann Casson) falls through the roof. Her father has vanished, and she's received an inscrutable telegram that mentions both the house and a missing necklace. Soon more suspicious characters turn up, all looking for the necklace, and none of them who they claim to be.