More Than Just A Three Pipe Problem, Watson

"That is the great Grimpen Mire," said [Stapleton]. "A false step yonder means death to man or beast. Only yesterday I saw one of the moor ponies wander into it. He never came out. I saw his head for quite a long time craning out of the bog-hole, but it sucked him down at last. Even in dry seasons it is a danger to cross it, but after these autumn rains it is an awful place. And yet I can find my way to the very heart of it and return alive. By George, there is another of those miserable ponies!" Something brown was rolling and tossing among the green sedges. Then a long, agonized, writhing neck shot upward and a dreadful cry echoed over the moor. It turned me cold with horror, but my companion's nerves seemed to be stronger than mine. "It's gone!" said he. "The mire has him. Two in two days, and many more, perhaps, for they get in the way of going there in the dry weather, and never know the difference until the mire has them in its clutches. It's a bad place, the great Grimpen Mire."