If this is "Intestinal Horror" then I Want Some More!

NIGHT LIGHT by Chris Burgoyne (2010 / 269 pp. / tp)
A bunch of soldiers rape and massacre the locals of a small town in Indonesia. But their party abruptly ends when the soldiers quickly get picked off...leaving the final soldier to face a strange old woman and some kind of large insect on his own.
Flash forward to Dallas, Texas. Aiming to satisfy his faithful clientel, Sims (the owner of an adult video store called 'Night Light') not only sells the latest in adult videos and novelties, but also keeps a back room area dedicated to the more unusual titles. When a package arrives from Indonesia, he opens it to discover an unmarked video which contains footage of the above mentioned soldier rapes, as well as their graphic slaughter.
But the box also contains something else.
On the same night Sims opens this package, aging adult film star Tassie is on hand to sign her DVDs, and a couple of college girls trying to get into a sorority show up on a dare. Without warning, a trio of demons (led by a baby-eating floating-head, entrail-dragging witch) emerge from Sims' imported package and attack, first by possessing one of the college girls, then by going after the staff ans regulars. It seems no one can even get close to these things without becoming the vitcim of mind control.
Burgoyne's NIGHT LIGHT is a fine example of how a self-published novel can be done the right way: besides the pro-level prose, his trio of creepy creatures causing havock in a clasutrophobic setting works quite well, and most of his characters are memorable, including one guy who is immune to the demons for quite a clever reason, and the aforementioned porn star who the reader will truly care for as her back story is revealed among the ensuing chaos.
With buckets of gore, much suspense, and a satisfying conclusion, NIGHT LIGHT is a solid horror novel that should have little trouble finding its audience.