Thorneycroft Huxtable, a principal at a New England prep school, comes to Holmes with the news that a student has been kidnapped. They must do what they can to track him down.
Holmes’s brother visits him and tells him that three pages of the secret submarine plans are missing. The rest of the papers were found with the body of Arthur Cadogen West, however the three missing could enable an enemy to construct the submarine.
A man comes to Mycroft Holmes and tells him of his strange encounter. Sherlock Holmes then becomes involved because of his brother’s laziness.
Holmes finds himself at a university town and discovers that a tutor’s office had been disturbed and Holmes suspects Bannister the servant.
A conitnuation of part 1 in which Dr. Watson receives a letter from an old friend that tells about a treaty that was stolen from his office. Watson refers the letter to Holmes to investigate.
Miss Sutherland entreats Sherlock Holmes to help her find her mysterious fiancee that has disappeared. However, he did not give her enough information in their rushed engagement.
Holmes becomes involved with a case that involves a robbery of an invaluable assortment of things and then the murder of a coachman of a nearby estate.
Sherlock Holmes is faced with a case involving a man that is lured away from his place of business and is caught up in strange activity.
The author describes the pursuit of the mythical Fountain of Youth.
Holmes is called to investigate a case about a man who shatters busts of Napoleon. When a murder occurs, Holmes must work faster to solve the mystery.
On the day before Christmas a man is caught in a fight and looses a goose and his hat. Sherlock Holmes is trying to figure out who the hat belongs to, when a blue carbuncle is found in the goose.
Dr. Watson receives a letter from an old friend that tells about a treaty that was stolen from his office. Watson refers the letter to Holmes to investigate.
Sherlock Holmes is faced with a bizarre case that is a family affair. Two brothers and a son all receive letters from the KKK, addressed from India that contain five dried orange pips, the omen of death. When it comes to be the son’s turn, he begs Holmes for his advice.
A man is found in an unusual business agreement and entreats Holmes for his help.
When Gaudfrey Staunton disappears, Cyril Overton asks Holmes to investigate. Dr. Armstrong is suspected.
A continuation of the previous story in which Holmes’s brother visits him and tells him that three pages of the secret submarine plans are missing. The rest of the papers were found with the body of Arthur Cadogen West, however the three missing could enable an enemy to construct the submarine.
Sherlock Holmes is faced with the case of the Lord St. Simon marriage in which the bride disappears after the ceremony, excusing herself to her room claiming to have a sudden indisposition.
When someone blackmails Lady Eva Blackwell, Holmes is called to the case. He disguises himself as a plumber and goes undercover to catch the blackmailer.
Holmes and Watson are visited by John Hector McFarlane. A murder occurs at Jonas Oldacre’s house in Norwood and McFarlane is accused. Holmes follows the clues to deduce that Oldacre faked his death.
The King of Bohemia seeks the help of Sherlock Holmes in securing a picture that could be used against him in the political scene.
A man comes to Sherlock Holmes seeking advice about the disappearance of a bizarre society of red-headed young men that are funded by a man who sympathized with red-headed men.
Holmes and Watson find more clues as to the kidnapping of a prep school student. When the clues point to James Wilder, Holmes and Watson stop at nothing to catch him.
Sherlock Holmes is faced with the Boscombe Valley Tragedy, in which a man is murdered and is son is accused of the crime.
Holmes is contacted by Violet Smith. When she is followed by a strange man in a bicycle, Holmes decides to get to the bottom of it. When Violet is abducted, Holmes goes after the cyclist and discovers they’re both on the same side. Holmes tracks down the killers.
A gruesome murder occurs in Forest Row and Police Inspector Stanley Hopkins asks Holmes for help. When Peter Carey’s (also called Black Peter) tobacco pouch is found at the scene of the crime, Holmes investigates.