‘I have been blind!’ cried the Colonel. ‘Of course, that was why he needed the candle, and struck the match.’

‘Undoubtedly. But in examining his belongings, I was fortunate enough to discover, not only the method of the crime, but even its motives. As a man of the world, Colonel, you know that men do not carry other people’s bills about in their pockets. We have most of us quite enough to do to settle our own. I at once concluded that Straker was leading a double life, and keeping a second establishment. The nature of the bill showed that there was a lady in the case, and one who had expensive tastes. Liberal as you are with your servants, one hardly expects that they can buy twenty-guinea walking dresses for their women. I questioned Mrs Straker as to the dress without her knowing it, and having satisfied myself that it had never reached her, I made a note of the milliner’s address, and felt that by calling there with Straker’s photograph, I could easily dispose of the mythical Darbyshire.

‘From that time on all was plain. Straker had led out the horse to a hollow where his light would be invisible. Simpson, in his flight, had dropped his cravat, and Straker had picked it up with some idea, perhaps, that he might use it in securing the horse’s leg. Once in the hollow he had got behind the horse, and had struck a light, but the creature, frightened at the sudden glare, and with the strange instinct of animals feeling that some mischief was intended, had lashed out, and the steel shoe had struck Straker full on the forehead. He had already, in spite of the rain, taken off his overcoat in order to do his delicate task, and so, as he fell, his knife gashed his thigh. Do I make it clear?’

‘Wonderful!’ cried the Colonel. ‘Wonderful! You might have been there.’

‘My final shot was, I confess, a very long one. It struck me that so astute a man as Straker would not undertake this delicate tendon-nicking without a little practice. What could he practise on? My eyes fell upon the sheep, and I asked a question which, rather to my surprise, showed that my surmise was correct.’

‘You have made it perfectly clear, Mr Holmes.’

‘When I returned to London I called upon the milliner, who at once recognized Straker as an excellent customer, of the name of Darbyshire, who had a very dashing wife with a strong partiality for expensive dresses. I have no doubt that this woman had plunged him over head and ears in debt, and so led him into this miserable plot.’

‘You have explained all but one thing,’ cried the Colonel. ‘Where was the horse?’

‘Ah, it bolted, and was cared for by one of your neighbours. We must have an amnesty in that direction, I think. This is Clapham Junction, if I am not mistaken, and we shall be in Victoria in less than ten minutes. If you care to smoke a cigar in our rooms, Colonel, I shall be happy to give you any other details which might interest you.’