When Emma's parents go on a cruise to celebrate their wedding anniversary, she is taken to Devon to stay with her aunt, uncle, and cousin Danny. Emma notices a beautiful white horse named Casper in a field nearby and tells Danny how much she'd love to ride him. At first, she is told that no-one can ride the horse. But come nightfall, Danny takes Emma to the field and they discover that Casper is in fact a magical horse! He sprouts wings and takes them on an amazing adventure...