Beatrice Gormley

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Although Alison's new cat, a stray named Sharkey, is not the tiger kitten she's always dreamed of, with Sharkey it was somehow love at first sight.
The only problem is Sharkey's strange collar, which sometimes annoys him and which even the vet can't get off. At first Alison thinks it may have come from Sharkey's former owners. but when she reads an article in a tabloid about cats as spies, and when eighth-grade science genius Marvin applies his intelligence to the collar problem, a different - and weirder - explanation begins to come out.
Too bad that Alison's best friend, Denise, thinks it's just a case of Alison's "immature pretending." Because the truth of the matter has hilarious, unexpected consequences for everyone.