2. The Riddle of the Cheap Flat

Mabel West leaves boarding school to go to London where she offers to work for Poirot. At first Poirot refuses but then Mabel stumbles on a puzzle which interests him.

3. Strange Will

Mabel West is visiting her great aunt Miss Marple. A young couple arrives to seek Miss Marple's help in finding some buried treasure which they believe their late Uncle Matthew bequeathed to them.

4. The Perfect Maid

Mabel West visits her great aunt Miss Marple. At St. Mary Mead, Mabel meets Gladys, a friend of hers who has just been dismissed from her job. Mabel persuades Miss Marple to help.

5. The Case of the ABC Murders, Part 1: Poirot Receives a Letter of Challenge

6. The Case of the ABC Murders, Part 2: A Town and a Name Beginning with 'B'

7. The Case of the ABC Murders, Part 3: The Culprit Appears

8. The Case of the ABC Murders, Part 4: Poirot Solves the Riddle

9. The Disappearance of the Prime Minister, Part 1: Pursuit in the Dover Strait

Lord Estair, the Home Secretary asks Poirot to help find the prime minister who has been kidnapped. However he is not used to Poirot's methods.

10. The Disappearance of the Prime Minister, Part 2: The Truth is in England

11. The Mystery of the Egyptian Tomb, Part 1: A Challenge from the Past

Sir John Willard, a noted archaeologist dies while excavating an Egyptian tomb. Lady Willard is worried because her son, Sir Guy Willard intends to carry on his father's work, regardless of the risks. She confides in Poirot that she is worried about the talk on the ground that a curse is at work at the site. Poirot agrees to protect her son.

12. The Mystery of the Egyptian Tomb, Part 2: The Curse of Pharaoh Men-her-Ra

13. Tape-Measure Murder

Mabel West gets involved in another murder investigation while visiting her great aunt Miss Marple at St. Mary Mead. A woman is found dead but her husband does not seem to be very upset. Naturally the suspicion falls on him.

14. Crime of the Gold Ingots

While watching Mabel participate in a treasure hunt, Miss Marple tells her about a mystery her father was involved in many years ago.

15. The Blue Geranium

Miss Marple and Mabel West are asked to help solve the mystery of the death of Mrs Mary Pritchard.

16. The Mystery of End House, Part 1: The Night of the Party

Poirot, Hastings and Mabel are at St. Loo enjoying a hotel that was a reward for solving a burglary. There they meet Nick Buckley who says she has had several narrow escapes in the past few days.

17. The Mystery of End House, Part 2: Concealed Love

18. The Mystery of End House, Part 3: Perfect Evidence

19. The Adventure of the Christmas Pudding, Part 1: A Commission from a Prince

Poirot is asked to help recover a ruby for a foreign prince.

20. The Adventure of the Christmas Pudding, Part 2: The Royal Family's Ruby

21. 4:50 from Paddington, Part 1: The Train a Murderer Rides

Elspeth McGillicuddy, a friend of Miss Marple, witnesses a murder on a passing train while on her way to visit St Mary Mead. The police stop investigating when they cannot find the body. Mabel persuades Miss Marple to send her on a dangerous undercover mission to find out the truth.

22. 4:50 from Paddington, Part 2: The Gathering Darkness

23. 4:50 from Paddington, Part 3: A Simple Motive

24. 4:50 from Paddington, Part 4: Marple vs. the Culprit

25. The Plymouth Express, Part 1: A Body in a Carriage

Poirot, Hastings and Mabel investigate the murder of a woman whose body was found on the Plymouth Express.

26. The Plymouth Express, Part 2: The Blue Dress

27. Motive v. Opportunity

A visiting lawyer, Mr Petherick, tells Miss Marple an Mabel West about a strange case where a will was changed but those who had the opportunity to do so did not have the motive while those who had a motive did not have the opportunity.

28. The Disappearing Cook, Part 1: A Forced Commission

Poirot, Hastings and Mabel are asked to find a cook who has disappeared.

29. The Disappearing Cook, Part 2: The Secret in the Trunk

30. Sleeping Murder, Part 1: Sleeping Murder

31. Sleeping Murder, Part 2: The Door to One's Memory

32. Sleeping Murder, Part 3: What Helen Loved

33. Sleeping Murder, Part 4: The Evil, Stretched Out Hand

34. Four and Twenty Blackbirds

Poirot becomes interested in a regular diner at a restaurant turns up on a day he does not habitually come and who then orders something he does not habitually eat.

35. The Disappearance of Mr Davenheim

The well known banker Mr Davenheim has disappeared. Sharpe challenges Poirot to solve the mystery within one week without leaving his apartment.

36. Death in the Clouds, Part 1: The Flying Locked Room

37. Death in the Clouds, Part 2: Madame Giselle of Paris

38. Death in the Clouds, Part 3: The Threat to Lady Horbury

39. Death in the Clouds, Part 4: The Heir to the Vast Inheritance