Every November on the island of Skarmouth, a perilous event captivates its inhabitants: the Scorpio Races. Lurid and lethal, these races are not for the faint of heart, as competitors mount the dreaded capaill uisce—feral water horses as enchanting as they are murderous. For those daring to participate, the stakes transcend mere survival. Sean Kendrick, a young man whose life is as enmeshed with the sea's whims as with the land's, harnesses the wild in an effort to maintain a sacred communion with the savage beasts. Meanwhile, Puck Connolly, driven by a desperate bid to save her family from ruin, enters the race astride her modest mare—a stark contrast to the capaill uisce. Unbeknownst to both, their fates entwine like the tumultuous waves against Skarmouth's cliffs, setting them on a collision course with each other and the deadly races that call to them. When two worlds clash amidst the roar of the ocean and the cry of the crowd, only the resilient will emerge from the Scorpio Races alive.