The UK is hit by a massive earthquake, but this is no ordinary earthquake, rather an unnatural disaster that someone has created for financial gain. It is a perfectly normal day at St Hope's when suddenly there is an earthquake, and it's off the chart! Strangely, there are multiple epicentres all over the country. In the aftermath of the devastation, Quake Aid is established as a charity to help rebuild people's lives. Carrie is over the moon as Well Fit Jim, the man behind Quake Aid, is coming to St Hope's. He is one of Carrie's heroes and has revolutionised fitness with his famous 'static sprint'. He has gyms all over the country. Rose and Oscar are immediately suspicious of him, but Carrie won't hear a bad word said about him. Professor Quakermass, a brilliant seismologist, slightly past his prime, contacts Frank. He thinks that there is more to these earthquakes than meets the eye. He implores the spies to investigate whatever avenue they can. Someone has set these earthquakes up for financial gain. Rose, Oscar and Carrie head to Well Fit Jim's Gym and discover that all is not what it seems. Can they stop another massive earthquake from happening before Britain collides with France?