Holmes and Watson match wits with an opera star intent on blackmailing a king.

A Norfolk squire consults Holmes about the stick figures drawn in chalk that have been terrorising his young American wife.

A young diplomat with the Foreign Office turns to Holmes for help when a sensitive treaty between Great Britain and Italy entrusted to his care disappears from his desk.

Holmes and Watson hasten to the aid of a terrified young woman, who reports being followed from the home of her employer to the train station by a bearded stranger lying in wait for her along a lonely bicycle path.

Servants find the body of Colonel Barclay in the morning room, while his wife is found unconscious on the sofa.

Miss Helen Stone comes to Baker Street for assistance after her sister mysteriously dies in the house of their cruel and eccentric stepfather.