Shipley Manor is ready to set sail, but how will Polly and Tom fare on her maiden voyage? Harry "Hopper" Hawkins has set them off on a special mission, but it's hard work helping the world "Get the Fizzle." What with interfering billionaires, icebergs in the Caribbean, flying alligators and armies of child-slaves, things are getting pretty tricky. To top it off, their old adversary Venetia Pike is back, this time with even darker and more twisted ideas. Can Tom figure out her plot in order to save him and Polly, and the very future of the "Fizzle" itself?