Ten-year-old Mark would rather be at home with his computer than holidaying at the beach. He certainly wouldn't admit he'd be pretty lonely doing that either. But everything changes when he meets Crabbo, a talking crab. Together they take on the camping ground bullies and turn his holiday into the best Mark's ever had.
Mark, Ellie and Crabbo, the talking crab, are on holiday at the beach where the Cripps are very unhappy. Fred and his mean gang are stealing from their milk bar, endangering their ability to stay in business. Can clever Crabbo come up with a plan to trap the bullies or will the Cripps be forced to close their shop?