I want to separate myth from evidence, and get at what we know, what we think, and what we can prove. I am considering writing a novel set in the Sengoku/Warring States period (1467 to 1615) and want some better information on shinobi clans in Iga and Koga (and other areas and groups), and their later relationship with the Tokugawa Shogunate. Methods, means, philosophy, that is what I am interested in. I don't want it to devolve into an 80s ninja movie or kabuki theatre. I would appreciate any help.

I also heard of Edo period ninja novels - were any ever translated?