Caitlin Watson was a Loser, she'd always been a Loser, ever since she met Stanley Uris when they were four. And then she met Bill, Richie, and Eddie, and the five became inseparable. And Caitlin, always the toughest of the bunch, would do anything to protect her friends: blackmail Greta Bowie, punch Henry Bowers, fight a fucking clown, Cait would do any of it. And Pennywise is going to have to learn what happens when someone messes with her boys.