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Meet Ottoline Brown and her best friend, Mr. Munroe. No puzzle is ever too tricky for the two of them to solve.
- ISBN: 9780061448799
- Author: Riddell, Chris
- Published: 2008 , HarperCollins
- Themes: Friend, Problem solving
- Descriptors: Early Years (ages 2-6), England (UK), Intermediate (ages 9-14), Mystery and Thriller
- No. of pages: 176