I found some samples of Eureka and Masks on Engine's website and was very impressed with the information, samples, and ideas provided, so I decided to buy the full ebook for both.
This book is very well written and provides lots of easily expandable/tweakable plots that work with any system.
I've already used a couple of the plot ideas in my game night and even with only a couple days prep time, the players the original storylines and twists that they dealt with.
I'm looking forward to delving deeper and finding more that I can use to add to my game.
[5 of 5 Stars!]