Frank Urwin and Richard Cleugh are two bachelor journalists sharing a flat in London. One evening while chatting, Urwin receives a telegram from a police acquaintance to come to the local police station at once. Urwin visits Inspector Patterson who is greatly agitated. Patterson invites Urwin for a drink and tells him of a strange occurrence at a local house. The two visit the house where they discover a dead young male and attractive young female. For some reason, Patterson is reluctant to report the apparent murders. While at the house, the telephone rings and Urwin answers it. A strange voice asks if the deed has been done? Urwin indicates it has and agrees to meet the caller at St. James's Park. Urwin finally convinces Patterson to report the crime and a second visit occurs with additional police. This time however, the dead female is not the same person.