A Grim and Sunken Vow

"Riadne's bloody coup on the Summer Solstice changed Arlo's life forever. In one fell swoop and a fool's bargain, she lost both her family and free will to the newly crowned High Queen. Now, with Arlo forced to use her powers as Luck's Hollow Star to help summon the rest of the seven deadly sins, Riadne stands closer than ever to achieving her dark goals. And Arlo isn't the only one trapped in a frightening new role. Her ex-Fury girlfriend, Nausicaä, is determined to do whatever it takes to stay by Arlo's side, even if that means becoming Riadne's pet assassin. Aurelian and Vehan, torn apart, struggle to survive on their own."--