Hank Wilson is a driver for a truck for a big transportation company which is in financial straits. He is in love with Doris Lacy, a waitress at the truck-stop where the company has its truck fleet serviced. Frequent accidents near the place leads the company to hire a private detective to investigate, and when the detective is murdered Hank is arrested as a suspect. The insurance company that covers the fleet has him released and he is sent back to work with instructions to investigate the accidents on his own. The trail leads to the uncle of Doris, and one of the part-owners of the company.
Virginia Cunningham is confused upon finding herself in a mental hospital, with no memory of her arrival at the institution. Tormented by delusions and unable to even recognize her husband, Robert, she is treated by Dr. Mark Kik, who is determined to get to the root of her mental illness. As her treatment progresses, flashbacks depict events in Virginia's life that may have contributed to her instability.
Leona Stevenson is confined to bed and uses her telephone to keep in contact with the outside world. One day she overhears a murder plot on the telephone and is desperate to find out who is the intended victim.
A gold mine in Arizona, that was formerly losing a lot of money, suddenly turns into a veritable money-making machine. However, the owner, instead of being happy about his now profitable business, insists to Charlie that something is fishy and that someone is out to murder him. Charlie and his "crew" travel to the mine, pretending to be tourists staying at a nearby dude ranch so as not to arouse suspicion, and discover that the owner may well be right--it looks like the mine is being used as a cover for criminal activities, and that someone is indeed out to murder him.
Hart and Moore are grave-robbers who provide cadavers to the medical students of 19th-century Edinburgh. When the supply becomes low and demand still great, the two decide to create their own supply, a plan that proves profitable when they stick to vagrants, prostitutes and drunkards. But when they poison likable Jamie, the townsfolk retaliate. NB: This film was originally written to be about Burke and Hare, but after it was completed, the British censors refused to allow its release on the grounds those names themselves were offensive; thus the entire soundtrack was recut so that new names - Hart and Moore - recorded by the film's actors, were cut into the previously recorded lines, replacing the offending "Burke" or "Hare", sentence by sentence.
After a whirlwind romance in Mexico, a beautiful heiress marries a man she barely knows with hardly a second thought. She finds his New York home full of his strange relations, and macabre rooms that are replicas of famous murder sites. One locked room contains the secret to her husband's obsession, and the truth about what happened to his first wife.
A hated country gentleman is murdered, and the inspector on the case takes the veiwer through his thoughts about the possible murderer and motives as he questions everyone concerned.
Sandra Carpenter is a London-based dancer who is distraught to learn that her friend has disappeared. Soon after the disappearance, she's approached by Harley Temple, a police investigator who believes her friend has been murdered by a serial killer who uses personal ads to find his victims. Temple hatches a plan to catch the killer using Sandra as bait, and Sandra agrees to help.