A dying man with a terrible secret is brought to 221b Baker Street by London cabby, Henry Wiggins. So begins the case of The Bulgarian Clockmaker. It is to involve Holmes and Watson in a desperate search for a young girls killer and to foil a Fenian dynamite plot. A visit to Scotland Yard and Inspector Lestrade frustrates Holmes. Watson, however, is intrigued by a mysterious engine which is the 'prime mover' in this fast paced story. Only Holmes's intellect and deductive powers can save the Prime Minister from destruction.