The Devil’s Engine is a machine from the darkest parts of history. It can make any wish come true—as long as you are willing to put your life on the line. When a sixteen-year-old asthmatic kid named Marlow Green finds himself trapped in a surreal firefight against nightmarish creatures in the middle of his New York City neighborhood, he discovers a squad of secret soldiers dedicated to battling the legions of the Devil himself. Faced with monstrous apparitions, ancient weaponry, and his own hellishly tedious high school existence, Marlow submits to a demonic deal with the infernal device that enables him to join the battle—if it doesn’t kill him first.

***

Alex's second attempt to break out of Furnace Penetentiary has failed. This time his punishment will be much worse than before. Because in the hidden, bloodstained laboratories beneath the prison, he will be made into a monster. As the warden pumps something evil into his veins--a sinisterly dark nectar--Alex becomes what he most fears . . . a superhuman minion of Furnace. How can he escape when the darkness is inside him? How can he lead the way to freedom if he is lost to himself?

***

I am no longer trapped in the darkness. But the darkness is still trapped inside me. We did it. We cracked the gates, escaped from Furnace. We're out, but we're not free. Not yet. Now the whole city is in lockdown — the roads sealed, the police scouring every building. And there are worse things here — creatures of unimaginable fury hunting us down. An unholy army, sent by Alfred Furnace himself.

Now a war is raging as he tries to bring the world to its knees. I can still feel the warden's poison inside me. It's the only thing keeping me alive, but it's turning me into one of them, into a monster. I don't know how much longer I can fight it before the rage takes over. If I don't find a cure soon then it will be me out there tearing this city apart, me feasting on blood.

If I ever want to be truly free then I have to travel into the heart of the darkness. I have to find Alfred Furnace before he finds me. We made it out but the nightmare followed us, and soon the whole world will be our prison...