Sean Mulcahy answered Uncle Sam's call. In the autumn of 1917, he left his home, his friends, and the girl he loved. On the killing fields of the Western Front, he vanished without a trace. Thirty years later his best friend Vince Sicario is a broken man. Split from his wife, run off the NYPD, his world swirls in the bottom of a bottle. Until Sean comes clawing at his door. Bleeding. Delirious. And looking not a single day older. Vince turns to the only person he trusts, his wife Maggie—the woman Sean left behind three decades earlier. Together they hit the streets of Hell's Kitchen, seeking answers to Sean's disappearance and mysterious return. But others are on the same trail, and something terrible is lurking in the dark alleys and dirty corners of the West Side. Wise guys are disappearing. Mutilated corpses are turning up. The cops are baffled and gangsters are running scared. Rumors abound of strange gatherings in the shadows, of ancient horrors reborn, of blood feasts and pagan rites rekindled. Some say the savior of the damned has come. Sean may be in terrible danger. Or the greatest danger of all—the Lucifer Messiah.