Captain Hastings' invitation to a reunion with his old friend Hercule Poirot brings them full circle, back to the rambling country house of Styles where they solved their first murder together. But both Poirot and Styles have seen better days. Despite being crippled with arthritis, there seems to be nothing wrong with the great detective's ‘little grey cells' - until he brands one of the seemingly harmless guests a five- times murderer. Have Hercule Poirot's deductive instincts finally deserted him, or is there really a serial killer determined to bring down the curtain on all of them?