Remaindered (2010)

Kevin Dangler is a once-famous author desperate to regain his lost glory while traveling the back-roads of middle America, selling remaindered, fifth-editions of his first book out of the trunk of his car. Along the way, he meets his ultimate fan, a woman who might be his salvation...or a novel way to die... and plays cat-and-mouse with a small-town detective Bud Flanek.