Sherlock Holmes and the Secret Weapon

"Sherlock Holmes and the Secret Weapon" is a 1942 American film directed by Roy William Neill and is part of the Sherlock Holmes film series starring Basil Rathbone as Holmes and Nigel Bruce as Dr. John Watson. The film is the fourth installment in the Rathbone/Bruce series produced by Universal Pictures.

In "Sherlock Holmes and the Secret Weapon," Holmes is pitted against his arch-nemesis, Professor Moriarty, who has plans to steal a new bomb sight, a crucial military invention. The film is set during World War II, and the plot involves Holmes trying to prevent Moriarty from delivering the secret weapon to the Nazis.

Basil Rathbone and Nigel Bruce portrayed Holmes and Watson in a total of 14 films, starting with "The Hound of the Baskervilles" in 1939 and concluding with "Dressed to Kill" in 1946. While these films took some liberties with Sir Arthur Conan Doyle's original stories and updated the setting to contemporary times, they are still well-regarded by fans and contributed to the popular image of Holmes and Watson in cinema.

"Sherlock Holmes and the Secret Weapon" is notable for its wartime setting and the inclusion of espionage elements, reflecting the concerns of the era in which it was produced.