"Endless Night" is a psychological thriller novel by Agatha Christie published in 1967. The story follows Michael Rogers, a young man with a humble background who dreams of a better life. He meets and falls in love with Ellie Guteman, a wealthy heiress, and they decide to build their dream home on the estate she inherited from her father. However, as they start to build their life together, strange and unsettling things begin to happen.

The couple soon discovers that their dream house may be cursed, and they start to experience a series of tragic events. Despite their efforts to uncover the truth behind the curse and the strange occurrences, they find themselves trapped in a nightmare they cannot escape.

As the story unfolds, the reader is taken on a journey of suspense and intrigue, with twists and turns that keep them guessing until the very end. The novel's dark themes and complex characters explore the depths of human nature, exposing the destructive power of greed, jealousy, and obsession.

The book was well-received upon its release, with critics praising Christie's skill in crafting a compelling psychological thriller. The novel's themes and characters were also praised, with many citing the story's ability to keep the reader engaged and guessing until the very end.

In summary, "Endless Night" is a gripping psychological thriller that explores the dark side of human nature. Agatha Christie's skillful storytelling and complex characters make for an engaging and suspenseful read that will keep readers on the edge of their seats. The novel's exploration of themes such as greed and obsession makes it a timeless classic in the genre of psychological suspense.