child abuse
One of the main characters is openly, and unabashedly, gay; and starts a straight man thinking about whether or not he could experiment with another man. The sheriff, a minor character, is also revealed (though it has nothing to do with the plot) to be bisexual.
The book is an okay story, but a bit 2-dimensional. We don't really learn much about any character. This is more a novelization of a slasher movie than anything else.