Michael Shannon is one of the finest new character actors working in films today; his performance here as a private investigator from New York, hired to trail a middle-aged man from Chicago to Los Angeles by train, is the centerpiece of "The Missing Person"...and is very nearly the entire show. Writer-director Noah Buschel was probably hoping to modernize the old private eye clichés (including booze, broads, and blaring saxophones on the soundtrack), but his movie doesn't really start cooking for at least a quarter of an hour into the proceedings. Buschel's pacing is deliberately slow, and Shannon's John Rosow is intentionally beleaguered and burnt-out, yet there's no reason to be so poky with this narrative (even Bogie livened up earlier on one of his cases). The film is well-produced and shot, though it runs the risk of losing viewers before it starts to take shape. Once it does, it becomes a rather fascinating throwback, its scenario seesawing between the old and new--like Philip Marlowe in the cell-phone era. **1/2 from ****