Top 3 in Top 10 best comics about Batman that have not been made into a movie.
Flashpoint: Batman Knight Of Vengeance is one of the best comics in the world of Batman. A mini-series told in the Flashpoint universe, where instead of Bruce's parents being the ones killed, Bruce is the opposite. The plot follows Batman in that timeline, it shows a version of Thomas Wayne, who can't stand the loss of his son and decides to single-handedly clean up Gotham.
This plot twists when Thomas isn't the only survivor - so is his wife, Martha, who is driven to become the Joker in this timeline. The series will require prior knowledge of Flashpoint's alternate universe if it is to be made into a standalone film.