The fourth partnership with Rathbone and Bruce as Holmes and Watson. The second one transferred in time to WWII. Dr. Tobel (Post), of Switzerland, has invented the secret weapon in question and Holmes is assigned to keep him and it out of the hands of the Nazis. A couple of the clues Holmes follows when Tobel goes missing harken back to Doyle's stories, but otherwise it doesn't have much in common with the literary creation. Sherlock dons a couple good disguises and the settings are fairly interesting. However, this Dr. Watson is pretty useless as is Lestrade, the mystery is not gripping, nor is Moriarty (Atwill) that threatening, and I don't like the changes to costumes, vehicles, or historical context to cheapen the costs.