Premise: The Infiltrator is an American film about an Israeli freelance journalist who travels to Germany c. the early 1990s and uncovers a dangerously pervasive underground Neo-Nazi faction with the intent to bring Nazism back to the forefront in Germany. It is based on the book "In Hitler's Shadow: An Israeli's Journey Inside Germany's Neo-Nazi Movement" by Yaron Svoray and Nick Taylor
Hypothesis: The Infiltrator is the most popular film based on a book.