The Watchers know all about Hellfire Academy. They also know who Kennedy’s father is. After weeks of travelling the world to find even a hint about the Watchers, Kennedy discovered their origins were a little closer to home. Instead of spending summer break in Italy with Gabriel, she’s spending it in the home of the most senior member of the Watchers. With the prophecy's warning echoing in her ears, Kennedy is reluctant to trust the Watchers, even when they ask for her help to defeat a fallen angel. But the Watchers have a piece of information Kennedy is desperate to get her hands on: who her father is. With secret missions, unbreakable vows, and an enemy shrouded in secrecy, it's not just Kennedy's future that's at risk. The prophecy might be bigger than anyone imagined and the only thing standing in the way of death and destruction is a nephilim and an archangel.