When competition for lucrative prizes ranging from money to placement on the Olympic Team escalates to the point where one desperate participant drugs horses at the River Heights Horse Show, Nancy, Bess, and George track clues to identify the culprit.

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.

Fairyland is preparing for the Fairy Olympics--but there's a problem. Jack Frost and his goblins are determined to win, even if it means cheating! Can Rachel and Kirsty help?

Carolina Aguasvivas knows just what to do with Paradise Ranch's new sponsored student, Rockwell Richards. He's clearly a perfect match for a gentle giant of a horse named Napoleon, as they both have mysterious pasts. Carolina can't wait to learn everything she can about the cute and thoughtful new boy...but Rockwell doesn't seem to appreciate her snooping -- or admiration.

Avery Donaldson and her three best friends are happy to be at Storm Cliff Stables for the summer, especially since gold medalist Anna Wainwright is supposed to be there to give riding lessons--but Anna is nowhere to be found, and Avery is convinced something has happened to her hero.