A love triangle forms the basis of this drama. It all begins in a steel mill when a steel worker ignores the besotted gazes of his landlady at the boarding house and falls in love with a gold-digger. His best friend also finds himself smitten by the seductive young woman. But when the one of the workers fritters away a collection that had been taken up for the wife of a deceased co-worker on a foolish bet, he and the vamp take off until the good-hearted landlady intervenes and convinces them to stay and take their lumps.

Moriarty is sentenced to death, and Sherlock Holmes prepares to retire to the country and marry his girl. But Moriarty has sworn that Holmes, Lt. Col. Gore-King of Scotland Yard, and his trial judge shall all be hanged too. When Moriarty escapes and proceeds to put his threat into operation, Holmes has to postpone his retirement.

A fugitive, dangerous madman reaches an English village where he confronts his former partner who left him for dead in the jungle after their discovery of a diamond mine. When the former partner also claims to have since lost the mine and all its wealth, which he took all for himself, and though the partner is still living in a state of luxury , the madman takes up an offer from a crazed scientist to make him invisible, something the scientist has already done with experimental animals, so that he can take revenge.

An unpolished racketeer, whose racket is finding heirs for unclaimed fortunes, affects ethics and tea-drinking manners to win back the sweetheart who now works for his seemingly upright competitor.