[5] Director David Mackenzie (Hell or High Water) adapts Alexander Trocchi’s novel about a Scottish drifter (Ewan McGregor) who falls in with a family living and working on a river barge, all while hiding what he knows about an alleged murder being publicized in the local papers. Mackenzie captures a suitably dreary tone for the movie, but it’s a challenging story to get into. McGregor’s …