"The Big Four" by Agatha Christie is a thrilling mystery where the renowned detective Hercule Poirot and his loyal companion Captain Hastings find themselves up against a shadowy international criminal organization. Hastings returns from South America, eager to see his friend Poirot, and quickly becomes entangled in a baffling case when they encounter a strange man who seems to know Poirot and warns of impending danger. This chance encounter pulls them into a complex and perilous game against the Big Four, led by the formidable Li Chang Yen, a powerful and cunning adversary. As Poirot and Hastings navigate a series of intricate clues and face unexpected twists, they must use all their skills to stop the Big Four's nefarious plans and unravel the secrets behind their global conspiracy, creating a suspenseful and action-packed narrative.

The Big Four
By Agatha Christie
When a detective and his friend stumble upon a mysterious, mud-covered man, they're thrust into a dangerous game against a criminal organization that threatens global security.
Summary
About the AuthorDame Agatha Mary Clarissa Christie, Lady Mallowan, was a British author known for her 66 detective novels and 14 short story collections, particularly those revolving around fictional detectives Hercule Poirot and Miss Marple. She also wrote the world's longest-running play, the murder mystery The Mousetrap, which has been performed in the West End of London since 1952. A writer during the "Golden Age of Detective Fiction", Christie has been called the "Queen of Crime"—a moniker which is now trademarked by her estate—or the "Queen of Mystery". She also wrote six novels under the pseudonym Mary Westmacott. In 1971, she was made a Dame (DBE) by Queen Elizabeth II for her contributions to literature. Guinness World Records lists Christie as the best-selling fiction writer of all time, her novels having sold more than two billion copies.
Dame Agatha Mary Clarissa Christie, Lady Mallowan, was a British author known for her 66 detective novels and 14 short story collections, particularly those revolving around fictional detectives Hercule Poirot and Miss Marple. She also wrote the world's longest-running play, the murder mystery The Mousetrap, which has been performed in the West End of London since 1952. A writer during the "Golden Age of Detective Fiction", Christie has been called the "Queen of Crime"—a moniker which is now trademarked by her estate—or the "Queen of Mystery". She also wrote six novels under the pseudonym Mary Westmacott. In 1971, she was made a Dame (DBE) by Queen Elizabeth II for her contributions to literature. Guinness World Records lists Christie as the best-selling fiction writer of all time, her novels having sold more than two billion copies.