Season 1
The Jewel Robbery at the Grand Metropolitan
Mabel West, holidaying with her father in Brighton, meets Poirot and Hastings and becomes involved in a case.
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.
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.
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.
The Case of the ABC Murders, Part 1: Poirot Receives a Letter of Challenge
The Case of the ABC Murders, Part 2: A Town and a Name Beginning with 'B'
The Case of the ABC Murders, Part 3: The Culprit Appears
The Case of the ABC Murders, Part 4: Poirot Solves the Riddle
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.
The Disappearance of the Prime Minister, Part 2: The Truth is in England
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.
The Mystery of the Egyptian Tomb, Part 2: The Curse of Pharaoh Men-her-Ra
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.
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.
The Blue Geranium
Miss Marple and Mabel West are asked to help solve the mystery of the death of Mrs Mary Pritchard.
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.
The Mystery of End House, Part 2: Concealed Love
The Mystery of End House, Part 3: Perfect Evidence
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.
The Adventure of the Christmas Pudding, Part 2: The Royal Family's Ruby
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.
4:50 from Paddington, Part 2: The Gathering Darkness
4:50 from Paddington, Part 3: A Simple Motive
4:50 from Paddington, Part 4: Marple vs. the Culprit
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.
The Plymouth Express, Part 2: The Blue Dress
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.
The Disappearing Cook, Part 1: A Forced Commission
Poirot, Hastings and Mabel are asked to find a cook who has disappeared.
The Disappearing Cook, Part 2: The Secret in the Trunk
Sleeping Murder, Part 1: Sleeping Murder
Sleeping Murder, Part 2: The Door to One's Memory
Sleeping Murder, Part 3: What Helen Loved
Sleeping Murder, Part 4: The Evil, Stretched Out Hand
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.
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.
Death in the Clouds, Part 1: The Flying Locked Room
Death in the Clouds, Part 2: Madame Giselle of Paris
Death in the Clouds, Part 3: The Threat to Lady Horbury
Death in the Clouds, Part 4: The Heir to the Vast Inheritance