The gripping fourth instalment in an epic series about Furnace - a terrifying, underground prison for teenagers - now with a stunning new cover.Alex thought that escape was impossible. He was wrong.We broke out of Furnace but we're still not free. The city is in lockdown - roads sealed, police everywhere. And there are worse things here: creatures of death sent to bring the world to its knees.I'm turning into one of them, into a monster. To put an end to this blood-crazed madness I have to travel into the heart of darkness. I have to find Alfred Furnace before he finds me.Soon the whole world will be a prison.Action-packed, gritty and gruesome - this is the perfect read for thrill-hungry teens. With striking new covers that really bring these chilling stories to life.

Alexander Gordon Smith is the author of the terrifying Furnace series, as well as The Inventors (shortlisted for the Wow Factor competition) and The Inventors and the City of Stolen Souls. He has also written a number of non-fiction books, as well as hundreds of articles for various magazines. He is the founder of Egg Box Publishing, an independent press that promotes talented new writers and poets, and is the co-owner of Fear Driven Films. He lives in Norwich.