36 NPC Secrets morbidly provides some useful secrets that can be used for NPCs, primarily for modern campaigns and, even then, those with serious adult themes. The PDF starts off great, with a decent format explaining the secret and a Suggestion of how it can be used. But a good many of the secrets veer off into adventure hook land and some, such as cannibalism and Pedophile feel incredibly adult to be in a PDF.
The Iron Word
The author has some good ideas, and this book works primarily for modern campaigns with adult themes and more realistically dark characters.
[3 of 5 Stars!]