Lang's most seminal film was M (1931, Germ.) - his first sound feature (bridging the gap between silents and talkies). It was an expressionistic psychological thriller about a child molester serial killer. The pedophile-psychopath was identified as Hans Beckert (Peter Lorre) - his coat back was marked in chalk with the letter "M." He was caught hiding in an attic, and taken to a large abandoned brewery building to stand trial, where he was questioned by a panel of underworld boss-leaders.
As noted above Watson reports Holmes skilled in the martial arts of singlestick and sword fencing-although the only use a sword by Holmes is the Jeremy Brett adaptation of " The Adventure of the Naval Treaty " in which Holmes uses a sword-cane to force Joseph Harrison to give up the stolen treaty papers! Holmes is also quite skilled in the use of unarmed combat-such as using jujitsu to knock the murderous Professor Moriarty to his doom and also in the art of boxing - he fought three rounds with prizefighter McMurdo ("The Sign of the Four"); he beat Joseph Harrison, and he knocked out the bully Woodley with a straight left cross ("The Adventure of the Solitary Cyclist"). Nevertheless Holmes has received injuries during his career - a knife cut on his right hand ("The Adventure of the Naval Treaty"); a cut on his right knuckles from a fight with a thug of Professor Moriarty ("The Adventure of the Final Problem"); being nearly strangled by the Cunninghams ("The Adventure of the Reigate Squire"); being beaten by the thugs of Baron Gunther ("The Adventure of the Illustrious Client"); Holmes also lost one of his canine teeth in a fight with a criminal named Matthews at Charing Cross Station ("The Adventure of the Empty House").