Leslie Perrins

Sherlock Holmes is drawn into a case when arch-enemy Moriarty arranges with an American gang to kill a country gentleman with a mysterious past.

When a foreign diplomat is blackmailed into joining a criminal conspiracy, Holmes suspects that shadowy mastermind Dr. Moriarty is behind the scheme.

This case takes the British sleuth on the trail of foreign agents who have captured an inventor with top-secret blueprints for a futuristic aircraft.