Sophie (Emily Mortimer) has an uneventful life at her late father's hat shop, but all that changes when she befriends wizard Howl (Christian Bale), who lives in a magical flying castle. However, the evil Witch of Waste (Lauren Bacall) takes issue with their budding relationship and casts a spell on young Sophie, which ages her prematurely. Now Howl must use all his magical talents to battle the jealous hag and return Sophie to her former youth and beauty.