Jessica Fletcher is summoned to London under false pretenses. She's told her British cousin Emma McGill has been killed in a drowning accident and her body not recovered. But when she gets to London she meets her cousin Emma, also played by Angela Lansbury in the back seat of a limousine.
It's all a ruse cooked up by both her solicitor Kristoffer Tabori and and Scotland Yard inspector Barrie Ingham. There have been some real attempts on her life and this is their way to flush out a potential killer.
Then there's a real killing that of maid Glynis Johns and soon enough the Jessica Fletcher Angela Lansbury is ferreting out the real killer.
Some nice performances also from Patrick MacNee as cousin Emma's husband who was formerly a promising Shakespearean actor but let that all go to seed and became a music hall entertainer and permanent attraction at Emma's music hall theater which they own. Kristoffer Tabori does well as the solicitor. There was a comment made that the accent Tabori used was disingenuous. Granted Tabori isn't British born, but he's a classically trained player in the tradition of people like Vincent Price and Franchot Tone who fit right into films with a British setting.
This was a well done story with a bit of a surprise perpetrator. At least I was surprised, I definitely had my money on the wrong horse.