Young office assistant Majorie will marry soon, however she's plagued by doubts if her fiance is the right one. On her last day at work, her male colleagues don't miss a chance to comfort her... and flirt.

During an annual board of trustees meeting, one of the trustees dies. Miss Marple thinks he’s been poisoned after finding a chemical on him. She sets off to investigate at the ship where he had just come from. The fourth and final film from the Miss Marple series starring Margaret Rutherford as the quirky amateur detective.