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                    PublishedEgmont, November 2013 | 
            
                    ISBN9781742976525 | 
            
                    FormatSoftcover, 96 pages | 
            
                    Dimensions19.7cm × 13.3cm | 
            
One day Billie and Jack find a note hidden under a rock at school. It seems to be written in code! It's time the two friends put their code-breaking skills to the test.