Jack really wants to impress his diving coach dad ... there's just one problem. Jack is the worst diver in the worst diving team in Damp Bottom, England. But when a new kid starts at school with magic swimming skills and an eagerness to share tips, Jack's luck might be about to change.

But when Jack's new friend gets into trouble - and the fate of a secret world hangs in the balance - it's up to Jack and the rest of his diving crew to save the day. Sometimes it's not about winning, it's about helping your friends when they need it the most, it's about team work...

• A not to be missed hilarious adventure story
• Bringing together the most decorated British diver of all time Tom Daley - and acclaimed children's and YA-and Carnegie-nominated author Simon James Green, whose latest middle-grade book Finn Jones Was Here was Indie Book of the Month in May
• With gorgeous illustrations throughout from Luna Valentine that bring the humour and adventure to life