"Poirot Investigates" by Agatha Christie is a collection of captivating mystery stories where the brilliant detective Hercule Poirot uses his sharp mind to solve puzzling crimes. The book starts by introducing Poirot and his friend, Captain Hastings, to a famous actress, Miss Mary Marvell, who needs their help. She's been getting strange letters that threaten her valuable diamond, called "the Western Star." From this mystery, there is a suspenseful atmosphere as Poirot figures out who is following a girl in town. This puts the reader on the edge of their seat as there is the mention of supernatural events, and the hint that there is danger regarding the diamond.

Poirot Investigates
By Agatha Christie
A brilliant detective must use his wits to protect a famous actress's prized diamond from looming danger.
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.