Which C.S. Lewis novel opens with children entering another world through a wardrobe?

The Lion, the Witch and the Wardrobe opens with children entering another world through a wardrobe.

Published in 1950, the novel follows Peter, Susan, Edmund, and Lucy Pevensie after they move to the countryside during the Second World War. Lucy discovers that an old wardrobe leads into Narnia, where the White Witch has imposed a long winter. The children become involved in a conflict involving Aslan, the rightful ruler and spiritual center of the story.

The book was the first published volume of The Chronicles of Narnia, although Lewis later wrote The Magician’s Nephew as a chronological prequel. That distinction causes occasional confusion about which book is first. The wardrobe itself belongs specifically to The Lion, the Witch and the Wardrobe.

The novel became one of Lewis’s most widely read works and has been adapted for radio, television, stage, and film. Its wartime setting also explains why the Pevensie children are sent away from London before their discovery of Narnia.