Curtain: Poirot's Last Case

The legendary detective saves his best for last as he races to apprehend a five-time killer before the final curtain descends in Curtain: Poirot's Last Case, the last book Agatha Christie published before her death.
The crime-fighting careers of Hercule Poirot and Captain Hastings have come full circle-they are back once again in the rambling country house in which they solved their first murder together.
Both Hercule Poirot and Great Styles have seen better days-but, despite being crippled with arthritis, there is nothing wrong with the great detective and his "little gray cells." However, when Poirot brands one of the seemingly harmless guests a five-time murderer, some people have their doubts. But Poirot alone knows he must prevent a sixth murder before the curtain falls.