Welcome back to Storm Cliff Stables! Ainsley, Cassidy, Khadija, and Ryleigh-the Four Horseketeers-can't wait to start their next summer at horse camp. Ryleigh Sommers wants to be Bree's new assistant at Storm Cliff. She's convinced if she can teach new camper Cassidy to ride a horse her chances at getting the job will improve. But can Ryleigh get Cassidy on a horse? And why would someone come to horse camp who can't ride? Aligned to Common Core standards...

First year camper Kianna Drake is technically too young to be a Pony Girl at Storm Cliff Stables, but in two days she will be officially eight and she is feeling homesick and a little left out, because the other Pony Girls do not seem to care.

Tabitha has been volunteering with her best friend Rachael at the Rocky Ridge Riding Center for three months, but she keeps getting in trouble because of her lack of focus--can working with the troubled horse, Diamond, help her to save both of them for the Riding Center?

At Storm Cliff Stables, Ainsley and her cabin-mates, the Four Horsekateers, are engaged in a pranking battle with another cabin group called the Core Four, but they soon find that this kind of activity can get out of hand--especially when somebody outside the group starts pranking everybody.

Bree has decided to give up riding after a bad fall at home, but she still enjoys summers at Storm Cliff Stables with her close friends, and learning how to care for the horses and other animals--but when the animals start disappearing one by one Bree is determined to solve the mystery.

Sasha and her horse, Charm, arrive in campus of the elite Canterwood Crest Academy, where is not exactly welcomed with open arms. Sasha is determined to prove she belongs and make the advanced riding team by the end of her first semester.

When Heather starts spending a little too much quality time with Sasha's almost-boyfriend, Jacob, their partnership is put to the ultimate test.