Flapjack would rather stay at home, but for Huxley, each new day sparkles with possibility and the chance of adventure!Huxley and Flapjack are enjoying a trip to the seaside when they meet Whizz, who invites them aboard his submarine to search for the shipwreck of the Isabella. Huxley’s excited to go deep-sea diving – he’s sure there’ll be treasure to find – but Flapjack can’t help worrying.

What if something BIG and FISHY finds them first…