Sherlock Holmes and the Earthquake Machine

Sherlock Holmes and his biographer, Dr. John Watson, are summoned to the presence of the consulting detective's brother, Mycroft, who demands that Sherlock should appear to retire from his practice, so that he can 'go undercover' in an anarchist group in East London. To Holmes's surprise the revolutionaries are led by an old adversary and, after the nihilists are dispersed, further clues led to yet another old enemy. The trail takes Holmes and Watson to Cornwall, where they find a macabre death in a private zoo and are nearly accused of murder. The pursuit leads Holmes to the court of the Tsar of all the Russians, where a demonstration of a weapon of unbelievable power takes place. In fact, the device is so earth-shattering that the Tsar refuses to accept that it was possible and dismisses its inventor, who turns his threats on London. Back in Baker Street, Holmes is confronted by the potential destruction of the capital and, with the active support of the Government (whose liaison officer with Baker Street is the young Winston Churchill), arranges the evacuation of London, although, at the last moment, the device is neutralized.