It’s impossible to really film The Killer Inside Me. It’s a question of medium — you can’t replicate the book’s suffocating interior monologue, the puffed-up rant and ramble of a serial killer, because as soon as you dramatize the events in question for a movie camera you make them real in a way that they’re not, quite, when they’re still sitting on the page. It’s the old question of show versus tell.