Miss Marple leaves St. Mary Mead for a trip to London's elite, Victorian, and "too good to be true" Bertram's Hotel, where she used to spend her holidays as a child. Soon after her arrival, a maid is found murdered on the roof and Miss Marple tries to uncover the truth with the help of another maid.
Old wounds are reopened for the Argyle family when a man suddenly turns up after being abroad and claims that the black sheep of the family could not have murdered its tyrannical matriarch.
A wealthy woman holds a party at her Devon estate for family and friends, including old schoolmate Miss Marple. When a solicitor and the hostess herself are both murdered, Miss Marple tries to find a clever killer with a devious plan.
Jason Rafiel, an old friend of Miss Marple's, dies and leaves her an unusual legacy, to grant his final wish: she has to uncover a possible murder that may or may not have happened already. All she gets are two tickets to a Mystery Bus Tour and the advice to invite someone trustworthy to the bus trip, the only thing she knows about the crime being the single word 'nemesis'.