Two brother/sister combos, Krystal and Kevin + Tracey and Matthew, take on the heavies when they find their beloved school convention site being closed. A game of volleyball is the clue for them to uncover strange happenings in an underground world. Krystal can't wait to find out what is going on, ventures out with her scared friend, Tracey, and they discover something amazing... Before they can tell anyone about their discovery, they are in a deep place, tied up...
With his usual perceptions and a keen wish to get his Big torch back, Matthew and Kevin try to find their sisters, fearing what will happen when their parents find out. Will they be able to rescue the girls before they disappear for ever and will they be able to stop the monster Pterodactyl man from his terrifying project? Fun, adventure, mystery and scary things all all in this story, with loads of new friends to meet...
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