The insane, corrupted Arch Angel Seth has been captured, so Anne, Con and Michael might have a moment to breathe, right?
Don't count on it.
Another team of Angels, the Cherubim, have arrived to wipe out the Angeli and kill any human who doesn't meet their standards. The first-arriving Cherub, Rathe, is a long-haired teen with the face of an angel. He seems like an unlikely villain, but he's created two Angeli-hunting Sentinels, including an evil ex-mercenary with nasty plans for Anne.
While Michael orchestrates the Angeli offensive, it's up to Anne and Con to find Rathe and stop him before he opens the floodgates to Chaos.