In the dark underbelly of a Paris-inspired fantastical city, two rival assassins are pitted against each other in a deadly game of revenge, where the most dangerous mistake of all is falling in love…​

Catherine Doyle is an award-winning author of children's literature, including the best-selling Storm Keeper trilogy and the best-selling Twin Crowns series, co-authored with Katherine Webber. Catherine holds a first-class BA in Psychology and a first-class MA in Publishing. Her published work, which includes ten novels for children and teenagers, has been published all around the world, and translated into over 25 languages. She currently lives in the West of Ireland with her husband Jack and their dog, Cali.