Tilly and Emily have started going to After School Club at Awelon Tyn, where they are taught how to care for their ponies as well as learning to ride. Here they meet Calvin, a troubled eleven year old, who is one of the few boys learning to ride. Soon Tilly, Emily and Isla discover that Calvin has problems of his own, and together with their favourite riding school ponies, Zippy, Freya and Norman, the children learn the true meaning of friendship...