Dean Lambert is trying to conquer his vertigo - but he's beginning to feel like he'll never jump from the high diving board he's nicknamed the Horror of the Heights. It doesn't help that his brother, Tim, is a championship diver, and his dad runs the Wave Crest Leisure Centre. His dad and brother are caught up in preparations for the leisure centre's upcoming diving championships. But then disaster strikes when the diving board collapses and Tim only just escapes being seriously injured. What's more, it appears the board has been sabotaged. Dean sets out to find the culprit - but will he catch them in time?