Authors: Jenny Goebel, Bonnie Bader, Theo Baker, Stephen Krensky, Dennis R. Shealy
Related Series: The 39 Clues: Doublecross
The Penguin Core Concepts book series by multiple authors includes books Elephant Twins, Hard Hat Zone, Fine Life for a Country Mouse, and several more. See the complete Penguin Core Concepts series book list in order, box sets or omnibus editions, and companion titles.
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