This is The Cthulhu game, in my opinion.
GUMSHOE and Cthulhu go so well together.
Drives, Stability & Sanity.... The power of Investigative Skills; this game is absolutely amazing. The section on the 1930s, Ken Hite is the master and this book is a must for anyone who is a fan of the era, investigation games, or cosmic horror.
[5 of 5 Stars!]