Spike woke in the night to the crash of thunder. She turned her bedside light on and sat up. Seconds after, the rain started. It sounded like buckets of water were pouring on the roof. She waited for it to stop, or at least slow down, but it kept up. It was like being under a waterfall.

Sheoaks Equestrian School first gymkhana is under threat from massive storms. For it to have any hope of happening, Tristan, Spike, Hattie and Monika need to work hard at restoring the riding school to a working condition. But there are other worries as well: Mrs Cooper needs another riding school horse and Jack's dog Scotch is seriously ill. And what is wrong with Monika?