Agatha Christie's 'Endless Night' is a gripping standalone psychological thriller that delves into the dark corners of human desire. It follows Michael Rogers, a restless young man, who falls desperately in love with the American heiress Ellie. Against the advice of others, they build their dream home on the beautiful but supposedly cursed Gipsy's Acre. Their idyllic new life soon turns into a nightmare as unexplained accidents and sinister events begin to unfold, leading to a shocking revelation. This novel, a departure from Christie's traditional detective stories, explores themes of greed, obsession, and the terrifying depths of human malevolence, culminating in one of her most unsettling and memorable endings. It's a masterful study of suspense and psychological manipulation.