From publisher blurb:
This hack adapts the STRONG RPG system to apply to a horror genre, such as those stories that involve terrifying eldritch beings and otherworldly experiences. A copy of the STRONG RPG system is required to run this hack; you can find it for free on this same storefront.
The big difference in this hack of the STRONG RPG is that most adventures will likely take place in the "real world", or at least a modified version of the real world where eldritch experiences are possible. It's assumed that your adventures take place in the early 20th century, but you can adapt these rules for nearly any time period. Alternatively, you could also use these rules for a fantasy or other setting. In this book, we make no major assumptions about your setting, only about genre.