Sadie and Willa have competed against each other on slalom courses in sunny Florida since they were kids. They were the two best skiers then, and they’re the two best skiers now. The only thing that’s changed is instead of playing Barbies in between runs, they now plot ways to beat the other. Turns out, there’s a fine line between friends and frenemies.

Now twenty-eight, at the height of their careers and shining an international spotlight on water skiing, the media—and Sadie’s legendary family with strong ties to a sketchy mega church—have written the narrative of a rivalry more cutthroat than the sport has ever seen.

It would all be straightforward—who’s the better skier?—if only the women didn’t carry dark secrets from their pasts, both of which have the potential to thwart everything they’ve worked for. Add in the fact that Willa has long been in love with Sadie’s husband—the third member of their childhood trio—and they’re left with a combative season ahead.

What no one knows, however, is that it will be far from a typical ski season, because at the end, someone will be dead and their lives will be changed forever.