Nobody knows it yet, but the people of Earth are in big, big trouble. Like - HUGE trouble. Oh, come on, where's your imagination? Double what you're thinking!And it's all got to do with a shadowy figure, an enormous tower, some sinister monsters, huge clanking and thundering metal oddballs, and people who are just like you… but not like you at all. Luckily Hamish and the PDF are around to help save the day! Aren't they??