Dressed to Kill (1946) aka Sherlock Holmes and the Secret Weapon

Sherlock Holmes sets out to discover why a trio of murderous villains, including a dangerously attractive female, are desperate to obtain three unassuming and inexpensive little music boxes.

Director:

 Roy William Neill

Writers:

 Arthur Conan Doyle (story), Frank Gruber(adaptation), 1 more credit »

Stars:

 Basil Rathbone, Nigel Bruce, Patricia Morison -via IMDB

https://archive.org/details/SherlockHolmesAndTheSecretWeapon