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

The Lion, the Witch and the Wardrobe introduces the magical wardrobe leading to Narnia.

Published in 1950, the novel follows four siblings—Peter, Susan, Edmund, and Lucy Pevensie—who stay in a country house during the Second World War. Lucy discovers that a wardrobe provides an entrance to the snowy land of Narnia, where the White Witch has imposed a long winter.

The book was the first Narnia story Lewis published, although later chronological editions place The Magician’s Nephew before it. That prequel explains the creation of Narnia and the origin of the wardrobe’s connection to the world. This difference between publication order and internal chronology is the most common source of confusion about the series.

The novel introduces Aslan, the White Witch, Mr. Tumnus, and several other enduring characters. Its title refers both to the ordinary piece of furniture and to the political and supernatural conflict unfolding beyond it.