内容简介：
It seems to be pretty certain, he said, "that this thing is the wing of a Desmodus or Vampire Bat. Now, according to our authority"--he touched a work which lay open on the other arm of his chair--"these are natives of tropical America, therefore the presence of a living vampire bat in Surrey is not to be anticipated. I am personally satisfied, however, that this unpleasant fragment has been preserved in some way."