The famed detective's brother tries to steal his thunder.

Sigerson Holmes has been living in the shadow of his famous younger brother Sherlock for years, which has given him a complex. Sigerson feels that he must constantly prove himself to be smarter than the famous detective. So when Sherlock Holmes and his assistant Dr. Watson have to leave the country and Sherlock asks Sigerson to deal with one of his cases, he enthusiastically accepts the challenge. While searching for some missing government documents which may have been stolen by Dr. Moriarty, Sigerson is aided by Scotland Yard detective Olville Sacker who has photographic hearing, and the lovely Jenny Hill.