In Agatha Christie's final Miss Marple mystery, the newly-married Gwenda Reed moves into her dream home, only to be haunted by visions of a long-forgotten murder. Convinced she witnessed a crime as a child, she seeks the help of the astute Miss Marple. Despite Miss Marple's warning to let 'sleeping murder lie,' they delve into the past, uncovering a cold case and stirring a hidden killer who will stop at nothing to keep their secrets buried forever. It's a suspenseful journey into memory and a race against time.