basil rathbone and nigel bruce return a sherlock holmes and dr. watson in this superior tale of holmes battle the 3rd reich and the mastermind genius of professor moriarty . the film open up in switzerland a holmes be in disguise a an old bookseller . he must bring dr. tobel and the tobel bomb site to england before the german can kidnap tobel . holmes succeed and the german recuit the evil professor . moriarty manages to outwit scotland yard and lestrad dennis hoey by kidnap tobel . the only clue leave by tobel be a list of dance men . who will break the hidden code of dance men and holmes or moriarty first . can holmes prevent the bomb site from fall into the german hand thereby save england from the precision bomb technique develop by tobel bomb site . watch and enjoy .