Related Series: Girl Wonder Series, Betsey Biggalow Series, Noughts and Crosses, Boys Don't Cry, Doctor Who Cross Cult
The Hippo Mystery book series by Malorie Blackman & Paul Chequer includes books The Deadly Dare Mysteries, The Computer Ghost (Hippo Mystery S.), and Lie Detectives (Hippo). See the complete Hippo Mystery series book list in order, box sets or omnibus editions, and companion titles.
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