Premise: Valentine is a 2001 American slasher film directed by Jamie Blanks, and starring Denise Richards, David Boreanaz, Marley Shelton, Jessica Capshaw, and Katherine Heigl. Loosely based on the novel of the same name by Tom Savage, the film follows a group of women in San Francisco who are stalked by a man whom they tormented during their childhood.
Hypothesis: tom savage was not an author