In the London suburb of Finchley, the Pevensie children, Peter, Susan, Edmund and Lucy, are endangered by a Second World War attack of German bombers by Nazi Germany’s Luftwaffe. They are then evacuated to the country home of Professor Digory Kirke, who is not accustomed to having children in his house, as Mrs Macready, the strict housekeeper, explains.
While the Pevensies are playing hide-and-seek, Lucy discovers a wardrobe and enters a wintry fantasy world called Narnia. Seeing a lamppost, Lucy encounters the faun Mr. Tumnus, who explains the land she has entered and invites her to his home. He puts Lucy to sleep by playing a lullaby on his flute. When Lucy wakes up, she finds Tumnus grieving, and he explains that Jadis, the White Witch, has cursed Narnia and it has been winter for 100 years. If a human is encountered they are to be brought to her. Tumnus cannot bring himself to kidnap Lucy, so he sends her home. When she returns to Professor Kirke’s house, hardly any time has passed in the normal world; her siblings do not believe her story, and when they look in the wardrobe to see only a normal back.
One night, Edmund follows Lucy into the wardrobe. He enters Narnia as well, and after searching for Lucy he meets the White Witch, who claims to be Queen of Narnia. She offers him Turkish Delight as well as the prospect of becoming king and having power over his siblings if he brings them to her castle. After she departs, Edmund and Lucy meet again and return; Lucy tells Peter and Susan what happened, but unfortunately, Edmund lies. Professor Kirke talks with Peter and Susan and suggests she is telling the truth, though they are unconvinced.
While running away from Mrs. Macready after accidentally breaking a window, the four siblings retreat to the wardrobe and enter Narnia. They discover Mr. Tumnus has been taken by the Witch, and meet Mr. and Mrs. Beaver, who tell them about Aslan. According to the beavers, Aslan intends to take control of Narnia from the Witch. The four must help Aslan; it has been prophesied that if two sons of Adam and two daughters of Eve sit in the four thrones, the White Witch’s reign will end.
Edmund sneaks off to visit the Witch. When he arrives at her castle, she is angry that he did not deliver his siblings. The Witch sends wolves to hunt down the children and the beavers, who barely escape. Edmund is chained in the Witch’s dungeon, where he meets Tumnus. The Witch demands that Edmund reveal where his siblings are. After Tumnus claims that Edmund does not know anything, The Witch tells Mr. Tumnus that 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 Lucy a healing cordial, a drop of which will bring back to life anyone injured, and a dagger to defend herself. Susan receives a bow and arrows and a magical horn that will summon help when blown, and Peter a sword and shield.