On the windswept island of Thisby, the annual Scorpio Races are held every November, where riders attempt to stay mounted on the deadly water horses called capaill uisce long enough to win. Puck Connolly, determined to save her family home, becomes the first girl ever to enter the races, riding her ordinary land horse. Sean Kendrick, a four-time champion with a deep connection to the water horses, finds his life intertwined with Puck's as they both prepare for the deadly competition. Their story explores courage, survival, and the bond between humans and the wild forces of nature.