Ghost at the Prom

At the high school prom, sixteen-year-old psychic medium Nick Michelson notices a frightening ghost who seems to be haunting a boy from another school. The spirit threatens Nick and warns Nick not to come near him or the boy again.
Nick does a little investigating and discovers that the boy, whose name is Tyler, lost his boyfriend in a drowning accident a year ago. Now Tyler is overcome by grief and apparently is also being haunted by his dead boyfriend.
Nick decides to try to help the two of them and, in the process, uncovers several secrets surrounding the ghost's untimely demise.
Meanwhile, the Shadow Demon has come to Gallowspine Mountains and has made itself known to Nick. The question is, why?