From publisher blurb:
The Cthulhu Hack: The Haunter of the Dark is an ENNIE-nominated accessory that takes H. P. Lovecraft's final Mythos tale of doomed writer Robert Blake and guides you, in clear steps, through the process of turning it into an adventure for Cthulhu Hack. With that approach in mind, you can then use the same tools and guidance to create classic adventures in mystery and horror.
Cthulhu Hack is a game of investigation and battling the sanity-shattering horrors of Lovecraftian gods and monsters. With an elegant dice mechanic and fast, player-focussed gameplay, Cthulhu Hack is designed for quick and easy pick-up play, with characters ready in 5-minutes.
This supplement includes:
an investigation—and sequel to The Haunter of the Dark, Lovecraft's final solo Mythos story. In Horrible Abysses, the Investigators pick up the trail left by Robert Blake and find that dark obsessions keep the Haunter’s threat alive;
thoughts, advice and guidance on breaking up (or down) one of Lovecraft's stories into gameable content;
pages of carefully crafted random tables to help spark your creativity or create new content for your adventures on the fly; and
an annotated version of H. P. Lovecraft's original suspenseful story of the doomed artist and writer Robert Blake. Filled with thoughts, annotations, and highlighted key elements, it picks out the potential game content as a guide to doing that same yourself.