The four naughty girls at the heart of "Pretty Little Liars" think their secrets are safe with Alison, but now they're receiving creepy messages from someone named "A." A primetime WB show based on this series is in development for fall 2006.

Pretty Little Liars 2009, Harper Teen

ISBN-13: 9780061801310

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Pretty Little Liars 2007, Harper Teen, New York, NY

ISBN-13: 9780060887322

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Pretty Little Liars 2007, Turtleback Books, New York, NY

ISBN-13: 9780606122610

School & Library edition

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Pretty Little Liars 2007, Ulverscroft Large Print Books Ltd, Anstey, Leics

ISBN-13: 9781847820266

Large Print edition

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Pretty Little Liars 2006, HarperCollins Publishers, New York, NY

ISBN-13: 9780060887308

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Pretty Little Liars 2006, HarperCollins Publishers, New York, NY

ISBN-13: 9780060887315

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