Riley and family fly north to Churchill, Canada, to watch polar bears hunt seals from the ice of the Hudson Bay. There's just one problem: no ice! For polar bears, no ice means no seals, and without food, the bears can quickly become hungry, weak, and dangerous! It's a race against time as everyone searches for clues to this puzzling climate mystery. Will the ice freeze in time -- or at all? And will the polar bears finally eat again?

Polar Bear Puzzle 2009, Scholastic Paperbacks, New York, NY

ISBN-13: 9780545068383

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Polar Bear Puzzle 2008, Scholastic Press, New York, NY

ISBN-13: 9780545068376

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Polar Bear Puzzle 2007, Eaglemont Press

ISBN-13: 9781600400049

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Polar Bear Puzzle 2007, Eaglemont Press

ISBN-13: 9781600400056

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