On leaving Cosgrove Ponson, Inspector Tanner walked slowly up the shady side of Regent Street, his mind still running on the statement to which he had just listened. To test its truth was his obvious first duty, and as he sauntered along he considered the quickest and most thorough means of doing so. From the very nature of the story he felt inclined to believe it. Too much independent testimony seemed to be available for the alibi to be a fraud.
And if this was so, he, Tanner, was on the wrong track, and was wasting time. He had already lost nearly a week over Austin, and all the time he was working on these blind alleys the real scent was getting cold. But as he reviewed the facts he had learnt, he felt he could hardly have acted otherwise than as he had.
He considered Cosgrove’s state
