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Tess has the ability to change into the form of any animal. When she meets Kevin, another "switcher," the teens join forces to fight the "krools," frozen creatures from the Northern Hemisphere that are plunging Earth into another ice age. Despite some unanswered questions and lapses in logic, the tense fantasy presents an intriguingly realistic picture of Tess and Kevin living inside the skins of rats, cats, and even dragons.