The Big Four

Set over the course of a year, this mystery features Hercule Poirot as he investigates the death of a mysterious man who appears in his apartment, leading him to a clandestine group of four powerful criminals. As he deciphers cryptic clues, Poirot faces dangerous challenges that threaten his life and that of his brother. The narrative includes beloved characters like Major Hastings and Countess Vera Rossakoff, weaving a complex tale of espionage filled with intrigue and suspense.