It’s unsettling—any child could be vulnerable, anyone could be at risk. M is directed by Joseph Losey and written by Norman Reilly Raine and Leo Katcher. The film features David Wayne, Howard Da Silva, Martin Gabel, Luther Adler, Steve Brodie and Raymond Burr. Michel Michelet composed the music, and Ernest Laszlo handled the cinematography. Fritz Lang’s 1931 original is a genuinely impressive classic, there's no denying it. While some consider remakes to be inherently flawed, this 1951 version exists, and thankfully, it turns out to be quite good—a product of its time (the film noir era)—and brings something new to the story. The narrative has been moved to Los Angeles, where a child murderer is at large. The police are under pressure to find him, as are criminal organizations because his actions are drawing unwanted attention to their activities. The plot unfolds in three distinct ways: through the police investigation, the mobsters’ efforts to locate and eliminate the threat, and by following the killer's disturbing behavior, Martin W. Harrow (Wayne). Staying true to the original film’s blueprint, Losey incorporates key unsettling images and characteristics of the killer while giving them a unique spin within the gritty downtown Los Angeles settings. The inclusion of locations like Bunker Hill, Angels Flight railway, and the Bradbury Building adds to the film's authentic period feel. Combined with Laszlo’s strikingly noir cinematography, Losey creates a powerful atmosphere. The cast delivers solid performances, featuring many familiar faces from film noir. Wayne stands out as the troubled child killer, receiving more screen time than Peter Lorre does in the original. He provides an alternative interpretation that works well for portraying a man consumed by his impulses. This is particularly evident at the film’s conclusion, when he's knocked to the ground and reveals his inner turmoil. It was arguably Wayne’s finest performance. It doesn’t quite reach the heights of Lang’s original, and the subplot about the criminal underworld worrying about their reputation feels somewhat contrived. There isn't a great deal of depth either; some explanation is offered for Harrow's disturbed nature—along with a touch of vigilante paranoia—but these serious themes aren’t fully explored. Nevertheless, this remake deserves recognition as a successful adaptation. 7/10

Source on TMDB