‘What about your French friend? You don’t know whom he may have written to. You don’t know that all your actions with the cask may not have been watched.’ ‘Oh, don’t make things worse than they are. Trace this Watty, won’t you?’ ‘Of course we will, but it may not be so easy as you seem to think. At the same time there are two other points, both of which seem to show he was at least alone.’ ‘Yes?’ ‘The first is the watcher in the lane. That was almost certainly the man who walked twice up your drive. I told you I found his footmarks at three points along it. One was near your little gate, close beside and pointing to the hedge, showing he was standing there. That was at the very point my man saw the watcher. ‘The second point concerns the horse and dray, and this is what leads me to believe the watcher was really Watty. If Watty was listening up the lane where were these? If he had a companion the latter would doubtless have walked them up and down the road. But if he was alone they must have been hidden somewhere while he made his investigations. I’ve been over most of the roads immediately surrounding, and on my fourth shot--towards the north, as I already told you--I found the place. It is fairly clear what took place. On leaving the cask he had evidently driven along the road until he found a gate that did not lead to a house. It was, as I said, that of a field. The marks there are unmistakable. He led the dray in behind the hedge and tied the horse to a tree. Then he came back to reconnoitre and heard you going out. He must have immediately returned and brought the dray, got the cask, and cleared out, and I imagine he was not many minutes gone before my man Walker returned. What do you think of that for a working theory?’ ‘I think it’s conclusive. Absolutely conclusive. And that explains the queer-shaped ladder.’ ‘Eh, what? What’s that you say?’ ‘It must have been the gangway business for loading barrels on the dray. I saw one hooked on below the deck.’ Burnley smote his thigh a mighty slap. ‘One for you, Mr. Felix,’ he cried, ‘one for you, sir. I never thought of it. That points to Watty again.’ ‘Inspector, let me congratulate you. You have got evidence that makes the thing a practical certainty.’ ‘I think it’s a true bill. And now, sir, I must be getting back to the Yard.’ Burnley hesitated and then went on: ‘I am extremely sorry and I’m afraid you won’t like it, but I shall be straight with you and tell you I cannot--I simply dare not--leave you without some kind of police supervision until this cask business is cleared up. But I give you my word you shall not be annoyed.’ Felix smiled. ‘That’s all right. You do your duty. The only thing I ask you is to let me know how you get on.’ ‘I hope we’ll have some news for you later in the day.’