Stephen King.
Plot Summary-
Guy who has a domination fetish takes his girlfriend to a remote getaway, locks her to the bed in handcuffs. She freaks over his behavior and kicks him in the balls, which triggers a heart attack. He promptly dies. Girl slowly loses her mind trying to escape. (There is another sub-plot with an actual serial killer that you may or may not want to keep in it). Could be a really interesting character study in downward spiraling.
¤t
