The world is stranger and more dangerous than they’d thought. Lee’s best friend Mal went missing four years ago on Bodmin Moor, when the pair were chasing rumours of monsters. Now Mal is back, but where has she been? Who is she working for? When government physicist Kay Amal Khan is attacked, the investigation leads MI5’s Julian Sabreur deep into terrifying new territory, where he clashes with mysterious agents of an unknown power. Julian’s only clue is some grainy footage of a woman who supposedly died on Bodmin Moor. Khan’s extradimensional research was purely theoretical, until she found cracks between our world and parallel earths where monsters live. These cracks are getting wider every day, who knows what might creep through? What will happen when those walls come crashing down?