"Three Courts, or Murder at the Ball" is a fascinating detective book written by the English writer Agatha Christie. In this novel, we meet the famous ruling judge Hercules Poirot, who decides to rest and relax at the luxurious Blue Easter Hotel during a fancy ball. But suddenly there is a loud explosion, and a corpse is found at the ball. Poirot enters the investigation, using his unparalleled sharpness of mind and eccentric approach to solving criminal mysteries. In the book "Three Courts, or Murder at the Ball", readers can enjoy the intrigue, unpredictable plot twists and the final revelation typical of Agatha Christie's works.