"We might call upon him so as to leave no stone unturned. I don't think you quite appreciate the difficulty of this case. The man may be innocent, but we have got to prove it."

"My dear Wigan, if Baines had said that Eade was a bibliomaniac I should have gone to West Street at once. Since he is only a lawyer, I am convinced we should get no useful information out of him. Besides, he might very reasonably resent our interference in his uncle's affairs. It will be time enough to communicate with him when we have made some discovery which will help Michael Hall."

Next morning we journeyed to Pershore.

"Yesterday you suggested that I had a theory, Wigan," said Quarles, who had been leaning back in the corner of the railway carriage apparently asleep, but now became mentally energetic. "As a fact, my theory went no further than this: A bookworm in all probability buys books; to buy books requires money; therefore he must have money. In Thornfield Mr. Parrish was considered a man of means; our friend Baines confirms that belief. My theory is established."

"It doesn't carry us very far," I said.

"It provides another motive for the murder—robbery. The bookseller's story suggests that Parrish must have kept a considerable sum of money in the house. It is said nothing was taken, but a large amount in notes may be stolen without leaving any noticeable space vacant. Just one step forward we may take. If such a sum existed, as is probable, remember Parrish might at times think of burglars, might have mentioned his fears, without giving a reason, to Hall, and Hall, having a life-preserver, might make a present of it to his friend."

I did not contradict him, but, personally, I was not at all convinced.

From the station we went straight to the pawnbroker's and had an interview with the assistant who had identified Hall as the man who pawned the salver. We arranged that I was a detective helping the professor, who was interested in Hall, and could not believe that he was guilty. It proved an excellent line to adopt, for it brought out the young fellow's sympathy. I asked questions, after stating our position, and for a time Quarles remained an interested listener. The assistant described Hall fairly accurately.

"He had pawned things before, hadn't he?" I asked.

"Yes."