An inmate at the infamous Dartmoor prison makes three identical musical boxes to be sold at auction. The final part of Universal's Sherlock Holmes film series.

"Sherlock Holmes: Dressed To Kill" (1946) Starring Basil Rathbone, Nigel Bruce, Patricia Morison Based on the stories by Sir Arthur Conan Doyle Written by Frank Gruber, Leonard Lee Produced & Directed by Roy William Neill

More info: en.wikipedia.org/wiki/Dressed_to_Kill_(1946_film)