Two years ago, Cassia Aureas escaped the Order of the Sanguines, an underground assassin agency where she was raised to hate and destroy alongside Cade Silver. A renowned bad boy and the love of her life, Cade just so happens to be her parents' twisted murderer. Having settled into normalcy, Cassia has done everything in her power to forget the Order. But when her school is attacked, she is forced to confront the people who took everything from her. Kidnapped by the cruel Head of the Order, Excelsior, Cassia must immerse herself back into the ranks of the Order of Sanguines in order to save the lives of her friends who were also taken to ensure Cassia's submission. Not only must Cassia worry about the survival of her friends, but of the newly recruited trainees, the complications, secrets, and threats of the Order, and the growing supernatural powers inside of her.