Then the spirit of Jack the Ripper seems to be very much alive in 1960s London as a series of brutal slayings by the Monster of London City has Scotland Yard baffled. In a macabre coincidence, a new play about the famous murderer is about to become a major West End hit... and the leading man is rapidly becoming the prime suspect!
Scotland Yard investigate when a woman, apparently the estranged wife of a London painter, is murdered with a shotgun in rural Surrey at the same time as the artist's striking model with her long black hair disappears.
After being mistaken for Scotland Yard detectives, two vaudevillians (Michael Whalen, Chick Chandler) try to solve a murder in a Midwestern town.
A disparate group of people meet as passengers on a superspeed train crossing the U.S. Aboard are a seductive blackmailer and the stage director he intends to frame, a woman chasing her husband who is running away with the blackmail victim, and the stage director's feisty leading lady.
A valuable gem from India is stolen in an old dark mansion and it is up to Scotland Yard inspector Charles Irwin to find out who did it among all the suspects who were in the house.
Americans Tommy Baldwin and Joe Dugan are hired to transport a fabulous diamond from Shanghai to San Francisco. They will be paid handsomely on success or killed on failure. The diamond is stolen as they take possession of it.
Secrets of Scotland Yard is Republic's spin on a plotline first elucidated in the old E. Phillips Oppenheim novel The Great Impersonation. After losing WW I, the German high command, with remarkable foresight, prepares for the next war by planting a spy in the British Admiralty. Edgar Barrier plays the dual role of the German spy and his British twin brother. When one twin is killed, the other assumes his identity. The question: is the surviving brother the "good" one or the bad? It is up to C. Aubrey Smith, cast as Scotland Yard inspector Sir Christopher Belt, to sort out the mystery. Though it owes a great deal to the aforementioned Oppenheim yarn, Secrets of Scotland Yard is actually based on a novel by Denison Clift, who also wrote the screenplay.
In this mystery, a newspaper executive and three of his colleagues conspire to have the owner of the highly-respected London Sun committed to an insane asylum. The hapless publisher manages to escape. Soon after, the four collaborators begin dying one-by-one. Oddly their obituaries appear in a rival publication before they are actually killed.
A rich but disliked elderly man invites his relatives to a family reunion at his home. Once the gathering is complete, he announces enigmatically that he intends to change his will before he dies. Before he can do this, he is murdered. His niece (Gynt), a detective story writer, has to put her theories into practice by solving a real-life murder mystery.