A sister and her disturbed twin are implicated in a murder and a police detective must figure out which one's the killer.

The first American television series of Sherlock Holmes adventures aired in syndication in the fall of 1954. The 39 half-hour mostly original stories were produced by Sheldon Reynolds and filmed in France by Guild Films, starring Ronald Howard as Holmes and Howard Marion Crawford as Watson. Archie Duncan appeared in many episodes as Inspector Lestrade. Richard Larke, billed as Kenneth Richards, played Sgt. Wilkins in about fifteen episodes. The series' associate producer, Nicole Milinaire, was one of the first women to attain a senior production role in a television series.

During an annual board of trustees meeting, one of the trustees dies. Miss Marple thinks he’s been poisoned after finding a chemical on him. She sets off to investigate at the ship where he had just come from. The fourth and final film from the Miss Marple series starring Margaret Rutherford as the quirky amateur detective.

The sensational details of a gruesome murder in The Daily Gazette have London in a panic, as a blood-thirsty madman - more vicious than Jack the Ripper - preys upon the city. Of greater concern to Scotland Yard, however, is that the account of the murder was published nearly two hours prior to the crime having been committed! Sherlock Holmes and Dr. Watson - the Great Detective and his faithful assistant and chronicler - find themselves challenged with one of their most baffling cases - "The Case of the Woman Who Was Murdered Tomorrow"! Will an innocent man be sent to the gallows? How much blood will be shed before a scarred fiend is brought to justice? ...And who are the mysterious Shadow Watchers, a coven of ominous figures who orchestrate terror from within the darkness? Starring Anthony D.P. Mann as Holmes and Terry Wade as Dr. Watson, "Sherlock Holmes and the Shadow Watchers" is a horrifying new adventure, produced with the kind permission of the Conan Doyle Estate*.