The Enchanted Pony (Fetlocks Hall Series #4)

Penny Simms and her best friend Pip are both pony mad. Luckily they attend the equestrian boarding school Fetlocks Hall, but there is a mystery surrounding the disappearance of Pip's parents, and Penny and Pip are determined to solve it.

With the help of Princess Sophie, a Centaureen, Penny and Pip encounter a magical world of mythical horses, where they struggle to release Pip's parents from an enchanted spell and reunite the family.