When Norman Graysmith is invited into the home of an aspiring serial killer, Aidan Mendle, he believes he has the subject for the documentary that will make his career.

After his girlfriend Nina dies in a car crash, Rob unsuccessfully attempts suicide. As he begins to overcome his grief, he falls in love with a co-worker, Holly. Their relationship is complicated when Nina, unable to find rest in the afterlife, comes back to life to sarcastically torment them whenever they have sex.