The gripping third instalment in Alexander Gordon Smith's epic series about Furnace, a terrifying underground prison for teenagers - now with the bestselling US cover.

We had one last shot at freedom and we failed. This time our punishment will be much worse than before, because in the bloodstained laboratories beneath Furnace lies the horrific truth behind the warden's plans.

Down here, monsters are made. I'm changing - something evil is being pumped into my veins. How can I escape when the darkness is inside me?

Action-packed, gritty and gruesome - this is the perfect read for thrill-hungry teenagers.