When Freddie Tallyfist scoops the quiz prize on Channel Three TV, his awful parents and his big brother, Jamie, are naturally jealous... but the whole family benefits because they all get to go on a sunshine cruise to Florida in a glass-bottomed luxury liner.Then things get fishy - very! Freddie and Jamie go exploring with their friends, and end up in a weird place - a huge room full of blubber!With friends there to help them, everything's fine until the sharks get mutinous, and treachery surrounds the team. Can the Tallyfist brothers, and Tammy, Charlotte and Tom, make it out alive?Finola Kane has taken two worlds - marine and human - and turned them upside down. This clever fable about envy, trust and wanting to seem more than we are is the entertaining and thought-provoking result. Catch the wave!