It’s something of a cheat to have Guy Hamilton directing a murder mystery in which the solution depends on minute aberrations of human behavior—since no one’s behavior in a Hamilton film is remotely human anyway, who’s to know? These all-star Agatha Christie adaptations (which by the mid-80s seemed to make up 50 percent of the British film industry—the Bond films, which Hamilton has also directed, comprised the other half) became increasingly slack and campy—though the cast here includes Jane Birkin, Sylvia Miles, Diana Rigg, and Maggie Smith, they might as well be indifferently talented female impersonators. Peter Ustinov repeats as Poirot, relentlessly making cute. With Colin Blakely, James Mason, and Roddy McDowall.