PDQ: Roughly half the book is based upon the PDQ system adapted for pulp Call of Cthulhu. Optional rules include Mythos Dice and Heroism. If you're not familiar with the PDQ system, it boils down to a simulationist task resolution system, where the GM sets a task difficulty, and the player rolls dice and modifies them to see if he succeeds. PDQ, however, adds some nice RPG color to this task. Rather than predefined skills, a player starts out with a set number of modifiers. He then selects his skills and traits. based on his character, subject to the GM. So, for example, a character can have Good [+2]: Personality: Fearless, encouragig the player to roleplay his character a certain way. The PDQ core system is available online for free.
Adventure: Three Kings: While it's obvious the writers did their research, I felt let down by the lack of specifics in this half of the book. The adventure felt more like a campaign of adventure seeds, than the highly descriptive Cthulhu adventures written by other companies.
Pregenerateds and NPCs: I should mention that the NPC Nazis, resistance fighters, and not-so-reliable souls in the adventure can be quite colorful. With the NPCs -- even ones on the same side -- factioned against each other, I hope Modipihus publishes a Fiasco-based version of this adventure. The adventure comes with four pregenerated characters.