The Scorpio Races take place every November on the small island of Thisby.This is no usual race.In the Scorpio Races, the riders are mounted on Capaille Uisce, beautiful, bloodthirsty water horses.Sean Kendrick, the returning champion, is a man of few words but has a unique understanding of these creatures.Puck Connolly is the first girl to enter the competition.She has to win or her family loses everything.This unusual pair forges a unique friendship, but only one can win the race.