Edmund sneaks off to visit the Witch. When he arrives at her castle, she is furious he has not delivered his siblings. The Witch sends wolves to track down the children and the beavers, who barely escape. Edmund is chained in the Witch's dungeon, where he meets Tumnus. The Witch demands Edmund reveal his siblings' location. After Tumnus claims that Edmund knows nothing, The Witch tells Mr. Tumnus Edmund betrayed him, then turns Tumnus to stone.
While Peter, Lucy, Susan, and the beavers travel, they hide from what they believe to be the White Witch. It is really Father Christmas, a sign that the Witch's reign is ending. Father Christmas gives them weapons to defend themselves. Lucy receives a healing cordial that can heal any injury. Susan receives a magical horn that will summon help and a bow and quiver full of arrows. Peter receives a sword and a shield. After evading wolves led by Maugrim, the group reaches Aslan's camp. Aslan is revealed as a huge and noble lion, who promises to help Edmund. Later, two wolves ambush Lucy and Susan. When Peter intervenes, Maugrim attacks him, and Peter kills him. Some of Aslan's troops follow the other wolf to the witch's camp and rescue Edmund. Peter is knighted by Aslan.
The White Witch journeys to Aslan's camp and claims Edmund, but Aslan secretly offers to sacrifice himself instead. That night, as Lucy and Susan covertly watch, the White Witch fatally stabs Aslan. In the morning, he is resurrected, citing magic beyond the Witch's understanding. Aslan takes Susan and Lucy to the Witch's castle, where he frees the prisoners she turned to stone. Edmund persuades Peter to lead Aslan's army. While saving Peter from the Witch by destroying her wand, Edmund is mortally wounded. As the Witch fights Peter, Aslan arrives with reinforcements and kills her. After Edmund is revived by Lucy's cordial, the Pevensies are crowned King Peter the Magnificent, Queen Susan the Gentle, King Edmund the Just, and Queen Lucy the Valiant.
Fifteen years later, the Pevensie children, now young adults, chase a white stag through the forest. They encounter the lamppost Lucy saw earlier and suddenly tumble out of the wardrobe at the same time and day they left, becoming children again. Lucy later attempts to return to Narnia via the wardrobe. Professor Kirke tells her he has tried for many years, and they will probably return to Narnia when they least expect it.