The year is 1892 and London is in the grip of evil. A demonic terror grips the streets, wreaking chaos as it helps the Legion, a vicious underground gang, to raise Hell on earth. Only the Watchers, a secret society of urchins and warriors, can stop them. An ancient prophecy claims one boy, Ben Kingdom, has the power to end this war. But Ben has a secret so deadly it could destroy everything the Watchers have worked for. Can he find the courage to fulfill his destiny... or will the city fall at The Feast of Ravens?