Chasm

Chasm follows a seventeen-year-old man named Seth as he journeys, both
physically and psychologically, up Mt. Aculeotis. He battles through his version
of dissociative identity disorder and fights to keep control as his body does
things that he doesn't agree with, ultimately making him lose the one person
who showed him a semblance of compassion. All the while he is dealing with
a demonic possession plot that ends up plunging him into a whirlpool of vivid
emotions and dastardly persons, some of whom are bent on killing him, or
worse. Now he has to decide how to handle an involvement with the devil,
how to save the one he loves, and how to save the one he doesn't- or die trying.