When Katharine joins the Stingrays Swim Team she finds herself once again in competition with her schoolmate, Vanessa, who swims for the Sharks.

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.

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.

In her first year at Storm Cliff Stables horse camp Daniela Cruz is having a hard time fitting in, partly because her cousin Gabriela seems to be so much better at everything to do with riding than she is--but Dani is a superior swimmer, a talent that could save the day if she can find the special ring that Aunt Jane lost in the lake.

This is eight-year-old Carly's first summer at Storm Cliff Stables horse camp, and she is already having a hard time following all the rules, so when she finds a garter snake and decides to keep it as a pet, she needs to keep it a secret.

Twelve-year-old CeCe Monroe is enrolled at Storm Cliff Stables as Cassidy because she does not want the other girls to know that she is an actress, so when Aunt Jane asks her to assist with the movie that is to be filmed at the stables she is mostly afraid of blowing her cover--but when she realizes that the movie man calling himself Paul Martino is not the man she knows, she finds herself cast in the role of detective.

After campers and their horses dress alike during Twin Day at Storm Cliff Stables, Paisley and Zoey decide to be twins for the whole summer. This starts to bother Paisley and prompts her to complain to Aunt Jane, but she gets warned about tattling. When Zoey puts herself in danger, should Paisley tell?