Underground — Chris Morphew

Book 4 in the bestselling Phoenix Files series. The end is coming - and Luke is running out of hiding places. He and his friends are trapped, paralysed and lost to the outside world. And the only escape is at the hands of Calvin and his men. Meanwhile, the people of Phoenix are growing suspicious, and the Co-operative may have to take extreme measures to maintain their control. But the worst is yet to come. Deep under Phoenix, Luke is about to uncover a secret that will change everything. And the clock is still ticking. There are 49 days until the end of the world.