Ben, Zara, Sam, and Marcia begin their summer vacation by helping Professor Ampersand build the Silver Turtle, a high-tech airplane.
This is thrilling enough, but things take an even wilder turn when a strange woman steals the airplane with the kids inside. She's trying to evade members of Noctarma, an international criminal organization that thinks the airplane is carrying a secret antigravity device that could be the key to world domination. They've got the wrong Silver Turtle, but they've also captured Professor Ampersand - and the kids will have to pull out all the stops to find the real Silver Turtle device before Noctarma does.
©2006 John Fardell; (P)2008 Penguin
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