With the success of “Knives Out,” it was a matter of time before Hollywood began spawning more ensemble whodunits. So why not return to a master – Agatha Christie? The 2022 remake of “Death on the Nile” has diversity to please modern audiences, but the ending is more like a Shakespearean tragedy (plus there’s a couple of head-scratching plot holes). Tortured genius Detective Poirot (Kenneth Branagh) is trying to complete an investigation, but bodies keep piling up. Whodunit? Who’s left? Gal Gadot is a shimmering light of a co-star, but there’s too much brooding darkness in this classy but somber production.