In The Open End Wrench, Orson Welles narrates a chilling tale from the archives of Scotland Yard's Black Museum. The episode begins with the introduction of an open end wrench, a common tool that becomes a pivotal piece of evidence in a murder investigation. A woman is discovered dead in a car wreck, and the circumstances surrounding her death raise immediate questions. The police are called to the scene, where they find not only the wreckage but also clues that suggest foul play.