Submitted by Zeta-Splash t3_yls4qt in books
If I were to answer this question, I would pick: Frabato The Magician, a fictionalization of Franz Bardon's biography, who was a Czech magician that fought against a black-magicians hermetic lodge in Dresden just before WWII. The crazy and unbelievable thing is that it apparently is a true story. IMO it would make a great film!
What would be your pick of a book that has been screaming to be turned into a movie and has been criminally ignored?