The letter requesting the renowned detective's services arrived too late -- one month after the sender's demise. But a client was a client, and Hercule Poirot was determined to get to the bottom of the mystery. Why had Emily Arundell believed her life was in danger? And why had the old lady revised her will only days before her death? Poirot faces one of the most unusual challenges of his career as he tries to determine which of the victim's disgruntled relatives did not have a motive for murder!