Attack of the Graveyard Ghouls is a novella written by R. L. Stine. It was first published in 1998 and was the eleventh book in the Goosebumps Series 2000 book series.
The fog shimmered up over the dark grass, over the bent, scraggly trees. Covering the hill, covering the old graveyard.
And then I heard the horrifying moan. Through the windowpane, I heard a long, low moan floating from the hill.
Human and animal at the same time.
So cold. So sad.