From the back of the book: Trapdoor Through Time! Fate has hurled you into a vortex of unbelievable horror - a vital flaw in the fabric of time that sends everything that has ever been or ever will be plummeting towards the cosmic scrapheap that marks the very end of time. Impossible creatures from ten millions years ago - or hence - hurtle past as you struggle to escape your onward plunge into oblivion. The slightest error of judgement on your part, or a momentary hesitation, and all will be lost - and you'll never again be able to find your way back through that terrifying trapdoor in time!