Which C.S. Lewis book introduces the wardrobe leading to Narnia?

The Lion, the Witch and the Wardrobe introduces the wardrobe leading to Narnia. Published in 1950, it is the first Narnia book Lewis wrote and the title most often used as the series’ entry point.

The story follows four siblings—Peter, Susan, Edmund, and Lucy Pevensie—who discover the magical land of Narnia through a wardrobe. Narnia is under the control of the White Witch, whose rule has created a long winter. The children encounter Aslan, the lion who is the central heroic figure of the series.

Publication order and internal chronological order are sometimes confused. The Lion, the Witch and the Wardrobe was published first, while The Magician’s Nephew describes events set earlier in Narnian history. The book’s title refers both to Lucy’s discovery and to the conflict involving the Witch and Aslan.