Can a teenage time traveller be the saviour the world desperately needs, while finding the strength to save himself? Joe's come a long way on his time travels. He's discovered the true meaning of friendship and the depths of his love for his family. But as time itself begins to unravel, and boundaries between the worlds of mortals and magic rip apart, Joe is faced with his greatest challenge yet. A timeless adventure boasting a cast of unforgettable characters from Crystal Palace past, fusing history, mystery, fantasy and science fiction into page-turning escapism that will grip young readers and the young at heart.