银色马 27（在线收听）

“It was the first link in my chain of reasoning. Powdered opium is by no means tasteless. The flavour is not disagreeable, but it is perceptible. Were it mixed with any ordinary dish the eater would undoubtedly detect it and would probably eat no more. A curry was exactly the medium which would disguise this taste. By no possible supposition could this stranger, Fitzroy Simpson, have caused curry to be served in the trainer’s family that night, and it is surely too monstrous a coincidence to suppose that he happened to come along with powdered opium upon the very night when a dish happened to be served which would disguise the flavour. That is unthinkable. Therefore Simpson becomes eliminated from the case, and our attention centres upon Straker and his wife, the only two people who could have chosen curried mutton for supper that night. The opium was added after the dish was set aside for the stable-boy, for the others had the same for supper with no ill effects. Which of them, then, had access to that dish without the maid seeing them?

“Before deciding that question I had grasped the significance of the silence of the dog, for one true inference invariably suggests others. The Simpson incident had shown me that a dog was kept in the stables, and yet, though someone had been in and had fetched out a horse, he had not barked enough to arouse the two lads in the loft. Obviously the midnight visitor was someone whom the dog knew well.

“I was already convinced, or almost convinced, that John Straker went down to the stables in the dead of the night and took out Silver Blaze. For what purpose? For a dishonest one, obviously, or why should he drug his own stable-boy? And yet I was at a loss to know why. There have been cases before now where trainers have made sure of great sums of money by laying against their own horses through agents and then preventing them from winning by fraud. Sometimes it is a pulling jockey. Sometimes it is some surer and subtler means. What was it here? I hoped that the contents of his pockets might help me to form a conclusion.

“And they did so. You cannot have forgotten the singular knife which was found in the dead man’s hand, a knife which certainly no sane man would choose for a weapon. It was, as Dr. Watson told us, a form of knife which is used for the most delicate operations known in surgery. And it was to be used for a delicate operation that night. You must know, with your wide experience of turf matters, Colonel Ross, that it is possible to make a slight nick upon the tendons of a horse’s ham, and to do it subcutaneously, so as to leave absolutely no trace. A horse so treated would develop a slight lameness, which would be put down to a strain in exercise or a touch of rheumatism, but never to foul play.”

“Villain! Scoundrel!” cried the colonel.

“它是我推理锁链中的第一个环节。弄成粉末的麻醉剂决不是没有气味的。这气味虽不难闻，可是能察觉出来。要是把它掺在普通的菜里面，吃的人毫无疑问可以发现出来，可能就不会再吃下去。而咖喱正是可以掩盖这种气味的东西。不可能设想，陌生人菲茨罗伊-辛普森那天晚上会把咖喱带到驯马人家中去用。另一种特别怪诞的设想是，那天晚上他带着弄成粉末的麻醉剂前来，正好碰到可以掩盖这种气味的菜肴，这种巧合当然是难以置信的。因此，辛普森这个嫌疑就排除了。于是，我的注意重点就落到斯特雷克夫妇身上。只有这两个人能选择咖喱羊肉供这天晚上的晚餐用。麻醉剂是在菜做好以后专门给小马倌加进去的，因为别人也吃了同样的菜但没有坏作用。那么他们两个人中哪一个接近这份菜肴而未被女启发现呢？

“在解决这个问题以前，我了解到这条狗不出声的重要性，因为一个可靠的推论总会启发出其他的问题来。我从辛普森这个插曲中知道，马厩中有一条狗，然而，尽管有人进来，并且把马牵走，它竟毫不吠叫，没有惊动睡在草料棚里的两个看马房的人。显然，这位午夜来客是这条狗非常熟悉的人物。

“我已经确信，或者说差不多确信，约翰-斯特雷克在深夜来到马厩，把马牵走了。为了什么目的呢？显然，是不怀好意，不然，他为什么要麻醉他自己的小马倌呢？可是，我一下子想不出为什么。以前有过一些案子，驯马师通过代理人把大量的赌注押在自己的马的败北上，然后为了欺骗，故意不让自己的马得胜。有时，在赛马中故意放慢速度而输掉。有时他们用一些更有把握更阴险狡猾的手法。这里用的是什么手法呢？我希望检查死者的衣袋里的东西后再作出结论。

“事实正是如此，你们总不会忘记在死者手中发现的那把奇特的小刀吧，当然没有一个神智正常的人会拿它来当武器使用。正象华生医生告诉我们的那样，这是外科手术室用来做最精密手术的手术刀。那天晚上，这把小刀也是准备用来做精密手术的。罗斯上校，你对赛马是有丰富经验的，你总该知道，在马的后踝骨腱子肉上从皮下划一小道轻轻的伤痕，那是绝对显不出痕迹来的。经过这样处理的马将慢慢出现些轻微的跛足，而这会被人当做是训练过度或是有一点风湿痛，可是却不会被人发现是一个肮脏的阴谋。”

“恶棍！坏蛋！”上校大声嚷道。