User blog comment:Pacersnation16/Help with an idea?/@comment-5239282-20140415154636

That's gonna be a toughy, considering how "demonic" messages have ran dry as far as originality goes.

Plot I think of right off the top of my head:

A girl moves to England with her childhood friend to escape her past with the help of the friend's family, taking only a necklace containing a key. They discover the key opens a drawer belonging to her friend, revealing the records.

The messages are doggerel that lead them to the friend's childhood home. The messages also tell of animal abuse and bondage. Once college ends, they and a group of friends travel to the secluded farm/ranch and discover the friend's extended family. They've transformed the home to a cozy bed and breakfast deal, but in secret, they're homophobic fascists who host dog fights.

The friends are imprisoned shortly after being invited for a spell, serving as food for the heavily-mistreated dogs. Meanwhile, they are subjected to extreme torture. The female protagonist is brainwashed and taken as the bride of one of the owners, and is forced to witness atrocity after atrocity. Ultimately, she breaks free and, unable to save her friends, drives on home. Stopping at another hotel, she recognizes that no matter where or how she runs, she'll inevitably face great loss and calamity. The story ends with her noticing that the owner of the establishment bears striking resemblance to her captor-husband.

... I dunno. Maybe you just wanna focus on the messages?