240 pages
English language
Published Nov. 7, 2021 by Hachette Children's Group.
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Pip and Bets's housemaid receives a spiteful letter in the post. Then Mrs. Moon receives one too. Who would want to make them so miserable? By piecing together the clues, the Find-Outers are determined to find the culprit. See how they get on in The Mystery of the Spiteful Letters.