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Rachel can't imagine why Bucky Greene, a scientist friend of her father's who's developing genetically engineered bananas, would show up at their New York City apartment in the middle of the night to leave a baby chimpanzee with them for a week -- or why they absolutely, positively can't tell anyone about it. What could possibly be "top secret" about an adorable chimp like Friday?

Rachel hasn't a clue, but when Friday turns out to be really, inexplicably intelligent -- and Bucky Greene turns up really, inexplicably dead (he slipped on his own banana peel) -- she suspects that some serious monkey business is afoot. And when chimp-flappers step into the picture, Rachel finds herself in a riotous, nonstop race for survival of the fittest.