Miss Marple believes she's seen a murder in a passing-by train, yet when the police find no evidence she decides to investigate it on her own.

In 1840s London, Dr. Thomas Bolton [Boris Karloff] dares to dream the unthinkable: experimenting with anesthesia gases to make surgery pain-free. While doing so, his demonstration before a panel of his peers ends in a horrific mishap with his patient awakening under the knife; he is forced to leave his position in disgrace. To complicate matters, he becomes addicted to his own chemical experiments and gets involved with a criminal gang led by Black Ben [Francis de Wolff], and a ruthless killer Resurrection Joe [Christopher Lee]. Unfortunately, this shady partnership leads Dr. Bolton to further ruin, culminating in his unwitting participation in murder — for which he becomes the first victim of a blackmail scheme.

Steven Sims is a diamond merchant who bullies his kindly hard-working clerk and disappoints his expectations when he takes into partnership an aristocratic ne'er-do-well.

During a holiday to the beach Jenny meets Alan and agrees to spend the week with him. Wanting to keep this a secret from her parents Jenny gets help from her friend Mary to pretend her whereabouts but disaster strikes during a boating accident. It is soon discovered Jenny was not with Mary. When the parents find out the truth they pressure the couple to get married, but Jenny thinks otherwise.

In a small English village everyone suddenly falls unconscious. When they awake every woman of child bearing age is pregnant. The resulting children have the same strange blond hair, eyes and a strong connection to each other.

Newspaper reporters compete with London police to solve a murder.

Three criminals plan to break out of prison the day before their release in order to carry out a daring jewel robbery, intending to establish the perfect alibi by returning to jail afterwards. First however they must get out, a task made more difficult by a new, stricter prison officer.

A middle-aged garage owner's life is turned upside down when his new mechanics gets it on with his sexy younger wife.

Paul Temple is called in to help Scotland Yard track down a serial killer who has murdered several wealthy women.

Lady Torrent attempts to sell some of her best Parisian gowns to get back into her husband's good books. Confusion ensues following a misunderstanding over an advertisement.