If you like Jörg Buttgereit's films,
Sex Murder Art is a great book to get.
It provides both a detailed analysis of his films, including excellent synopses, but also a wealth of back-ground material. He gets to grips not only with the films, but also with the disparate (and occasionally desperate) cast and crew. The book is extremely well-produced and the photographs and graphics serve to give a taste not only of the films but also on the milieu that they traverse.
I bought it
here