The four siblings find a wardrobe that leads to the magical land of Narnia. Previously, Lucy had found it but her siblings did not believe her and Edmund lied about it.
They meet the White Witch who convinces Edmund to betray his siblings. She has cursed Narnia so it is always Winter and never Christmas.
The rest of the children, Peter, Lucy, ans Susan, meet the beavers. They are very kind and help the children throughout their journey. They soon find Aslan who is willing to help them aswell.
So, Alsan talks with the White Witch and sacrifices himself rather than Edmund. Lucy and Susan overhear their conversation and are shocked. Aslan was killed but came back to life because of the deeper magic.
They all battled where Peter proved himself. The White Witch died and the good side wins and all the statues become normal once again.
The Winter storm ends and Peter, Susan, Lucy, and Edmund all become kings and queens or Narnia. They return home after being in Narnia for so long and become their normal age once again.