Hercule Poirot is attending a Victory Ball, a glamorous event celebrating the end of World War I. During the ball, a young woman named Coco Courtenay collapses and dies. It initially appears to be a tragic accident, but Poirot's keen observation skills reveal that it was a murder disguised as an accident.
Poirot is approached by a woman named Miss Todd, who believes that her cook, Eliza Dunn, has disappeared under suspicious circumstances. Poirot investigates and discovers that there is more to Eliza's disappearance than meets the eye.
Poirot is called to Cornwall to investigate the death of a wealthy man named Reverend Dodd. His death appears to be a suicide, but Poirot suspects foul play. Through careful questioning and deduction, he unravels the mystery and reveals the true cause of Dodd's death.
Poirot is consulted by a wealthy businessman, Marcus Hardman, whose son Johnnie Waverly has been kidnapped. Poirot investigates the case and eventually uncovers the truth behind the kidnapping and the identity of the kidnapper.
A valuable pearl necklace is stolen from the home of a wealthy woman, Miss Violet de Merville. Poirot is called in to investigate, and he soon discovers that the thief left behind a cryptic note. Poirot's meticulous examination of the evidence leads him to a surprising conclusion about the thief's identity and motive.
Poirot is asked to investigate the mysterious murder of Mr. Rolf, a wealthy man who was found dead with a playing card, the King of Clubs, placed on his body. Poirot unravels the complex web of relationships and secrets among Rolf's family and friends to solve the murder.
Poirot is called upon to examine a case involving a disputed inheritance. The Lemesurier family is torn apart by a legal battle over a valuable estate. Poirot's astute observations and deductions help to reveal the truth and resolve the inheritance dispute.
Poirot is approached by Mr. Ridgeway, who seeks his help in locating a lost gold mine. Poirot investigates the intriguing case and uncovers a tale of greed, deception, and treacherous motives as he seeks to find the elusive lost mine.
Poirot boards the Plymouth Express train and becomes embroiled in a murder mystery whena wealthy woman named Mrs. Rupert Carrington is found dead in her compartment. Poirot meticulously examines the clues and interrogates the passengers to uncover the truth behind her murder.
Poirot is enlisted by the government to recover stolen submarine plans. The plans, which are of vital importance to national security, have been stolen by a foreign spy. Poirot employs his investigative skills to identify the spy and retrieve the stolen plans.
Poirot is called to Market Basing to investigate the death of Mrs. Enderby, a wealthy woman who died under suspicious circumstances. Poirot delves into the lives of the Enderby family and their acquaintances, unraveling a complex mystery with a surprising solution.
Poirot investigates a case involving the death of Mrs. Pengelley, who was found dead in her bungalow. Her death is initially thought to be a suicide, but Poirot's examination of the evidence suggests otherwise. He unravels a complex web of relationships and uncovers the truth behind her demise.
Poirot visits a restaurant called the Yellow Iris, where he observes a man named Anthony Chapell behaving strangely. Later that night, Chapell dies mysteriously. Poirot suspects foul play and delves into the lives of the restaurant's patrons to uncover the truth.
Poirot is consulted by Mr. Leopold Reynolds, who believes that his brother, George Reynolds, has stolen their deceased father's will. Poirot investigates the family dynamics and legal intricacies surrounding the missing will, ultimately revealing the truth.
Captain Arthur Hastings visits Poirot and shares an old case from their time in Belgium during World War I. Hastings believes that Poirot made a mistake in solving the case. Poirot reviews the case, known as the "Aberdeen Case," and explains his actions and reasoning.
Poirot recounts his involvement in a case concerning the discovery of an Egyptian tomb and a series of deaths associated with it. He explains how he unraveled the mystery behind the deaths and the tomb's curse.
Poirot receives a letter from a woman named Mrs. Ferrars, who fears for her life. He arrives at her home to find her dead from an apparent overdose. Poirot suspects murder and investigates the circumstances leading to her death, ultimately exposing the truth.