Partners in Crime follows the adventures of a husband and wife detective duo, Tommy and Tuppence, as they solve various crimes. When a murder investigation leads them to a secret device that can cause age regression, the couple must race against time to stop those who want to exploit its powers.

By the Pricking of My Thumbs is a comedy mystery movie based on Agatha Christie's novel. It follows the husband-and-wife sleuths Tommy and Tuppence as they investigate a series of strange events that occur in a retirement home. As they uncover clues and delve deeper into the mystery, they discover a sinister plot involving poison, suicide, and a graveyard.

A married couple, who are sleuths, are hired to investigate a murder that takes place in an old mansion during Christmas. As they unravel the clues, they encounter suspects, including a witness to the murder and a family doctor, while dealing with themes of money, greed, and family relationships.