This is a famous old movie. 
This is a famous old movie. 

M is a famous German mystery film from 1931. 

M is a famous German mystery thriller film from 1931. 

The film uses many new ideas to tell its story. One special idea is a musical leitmotif. A leitmotif is a short tune that repeats to represent a person or idea. In this movie, the character Hans Beckert whistles "In the Hall of the Mountain King." This song helps the audience recognize him. The director also used long tracking shots to move the camera through scenes. He used reflections in glass to show different feelings. Lang did not show any actual violence on the screen. He wanted the audience to use their own imagination for the scary parts.
Fritz Lang worked hard to make the story feel real. He spent eight days inside a mental institution to do research. He even met real criminals to learn about them. The story is set in a city that feels like Berlin. Characters use the Berlin dialect when they speak. A map in the film even shows the Alexanderplatz area. The police in the movie use new tools for that time. They use fingerprinting and handwriting analysis to find clues. 
Many parts of the film come from real life in Germany. The criminal groups in the movie are called Ringvereine. In real life, these were wrestling clubs that acted like organized crime groups. They had a strict structure and even helped the families of members in prison. The main character, Hans Beckert, was played by Peter Lorre. This was his first big starring role. Before this, he mostly acted in comedies. The police inspector, Karl Lohmann, was based on a real police director named Ernst Gennat. 
The film is a deep look at how people react to fear. It shows how both the law and criminals can work toward the same goal. Even the criminals hold their own kind of court to judge the man. This makes the movie more than just a simple mystery. It explores why people do bad things and how they are caught. An American remake was even made in 1951 by Joseph Losey. Even today, people still study this film to see how it changed movies. It remains a very important part of film history. 
M is a landmark German mystery thriller film released in 1931. 
The film utilizes several cinematic innovations to build tension. One major technique is the musical leitmotif. A leitmotif is a recurring musical theme associated with a specific person or idea. In M, the character Hans Beckert repeatedly whistles "In the Hall of the Mountain King" by Edvard Grieg. This sound allows the audience to identify him even when he is not fully visible. Lang also employed long tracking shots, where the camera moves continuously through a scene. He frequently used reflections in glass to create an expressive visual style. Interestingly, Lang chose not to show any actual violence or deaths on screen. He believed that suggesting violence forced the audience to use their own imagination to create the gruesome details.
The story is set in a city that mirrors Berlin. While the location is never explicitly named, the characters use a distinct Berlin dialect. A police map labeled "Berlin" and references to the "Alex," or Alexanderplatz, confirm the setting. The police use modern forensic techniques to find the killer. These include fingerprinting and handwriting analysis to study an anonymous letter sent to newspapers. Inspector Karl Lohmann leads the homicide squad. He instructs his men to check the records of recently released psychiatric patients. This focus on specialized investigative work is a key part of the procedural style.
The film depicts two different groups hunting the same man. The police conduct raids in various parts of the city to find clues. Meanwhile, the criminal underworld is also disrupted by the police activity. This pressure leads the bosses of the Ringvereine to hold a conference. The Ringvereine were real-life organized crime groups in Germany. Though they were officially wrestling associations, they functioned like a structured criminal syndicate. They even provided financial support to the families of members who were imprisoned. In the film, these criminals organize their own manhunt using beggars to watch the children.

Production of the film involved significant challenges and real-world research. Fritz Lang spent eight days inside a mental institution to study his subject. He met several real criminals to prepare for the roles. The film's production was also impacted by the political climate in Germany. When Lang advertised the film's original title, he received threatening letters. A studio head even denied him space because he suspected the film depicted the Nazi Party. Eventually, the film was shot over six weeks at the Staaken Zeppelinhalle studio. The lead actor, Peter Lorre, was a comedic actor before this role. M became his first major starring role and changed his career trajectory.

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