Blenkiron said that there was no evidence that a single brain was behind it all, for there was no similarity in the cases, but he had a strong impression all the time that it was the work of one man.

We managed to close some of the bolt-holes, but we couldn't put our hands near the big ones.

'By this time,' said he, 'I reckoned I was about ready to change my methods.

I had been working by what the highbrows call induction, trying to argue up from the deeds to the doer.

Now I tried a new lay, which was to calculate down from the doer to the deeds.