This is an excellent Fate Core supplement. The mechanics blend seamlessly with those of the core rules to provide the GM with the means to present horror in a game. You can take a little bit and add it to an existing campaign, or build a complete horror-themed world. The discussions of horror tropes alone are worth the price, and because the toolkit offers guidance as well as mechanics, it can be used in a system-independent way.
[5 of 5 Stars!]