The Greek Interpreter: In this adventure, we are at last introduced to Sherlock Holmes' brother, Mycroft, the only relative of whom Watson's friend has ever openly spoken during their long assocation. Mycroft, says Sherlock Holmes, is Sherlock's superior in intelligence and observation but cannot put the gifts to practical use. They stroll to the singular accommodations of the Diogenes Club, and as Dr. Watson becomes acquainted with the elder Holmes, Mycroft introduces them to a Grecian interpreter.

The Naval Treaty: Holmes must recover a stolen document, prevent a diplomatic crisis between England and Italy, and save the career of a young and rising diplomat.

The Final Problem: Sherlock Holmes' determination to destroy the powerful criminal organization of Professor Moriarty reaches its crisis as Holmes and Watson attempt to track down and finally apprehend the criminal genius behind the most foul and evil events plaguing the good people of England.

The Adventure of the Empty House: While still grieving over his great friend's death, Watson is stunned, relieved and joyful when Holmes suddenly appears and reveals that he has escaped an untimely end in that fatal struggle with his mortal enemy, Moriarty, at Reichenbach Falls. The criminal underworld suspects this, says Holmes, and Watson is drawn anew into Holmes's plot to deceive his enemies and foil a probable attempt upon his life.

The Adventure of the Norwood Builder: Young John McFarland is accused of the violent murder of a man who has just left all his worldly goods to the accused in his will.