Kenneth Branagh's Agatha Christie adaptation “Death on the Nile” begins with a flashback to the trenches of World War I before shifting to 1930s London two decades later, but that’s nothing compared to the time that's passed since Branagh's preceding 2017 whodunit “Murder on the Orient Express.”
That film, which packed a bevy of stars aboard an opulent locomotive, was a saggy contrivance that lacked the warm fizz of Sidney Lumet's 1974 version, with Albert Finney. But “Murder on the Orient” did offer a welcome reminder of two immutable cinematic maxims: Train movies are irresistible and whodunits are, generally speaking, a hoot. It was an unexpected box-office hit, and a sequel, with Branagh again directing and returning as the mustachioed Belgian detective Hercule Poirot, was quickly ordered up with visions of something like a Christie-verse.
