Are all bicycle tyres the same? How many different kinds of bicycle tyre are there? When someone cycles over soft wet ground, the tyres leave tracks on the ground – but one tyre makes a deeper track. Is it the tyre on the front wheel or the back wheel?
When the Duke’s son is kidnapped from Dr Huxtable’s school, it is important to know the answers to questions like these. Sherlock Holmes, and his old friend Dr Watson, spend many hours looking at the mud on Lower Gill Moor. They find the tracks of bicycle tyres, the tracks of sheep and of cows – and they also find a body. Now there are even more questions, and Dr Watson thinks it is not possible to find the answers. ‘Come, come, Watson,’ says Holmes. ‘Every mystery has an answer.’
But even Sherlock Holmes is surprised by the answer to this mystery…
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