Introverted student Sara Novak doesn't live the typical college life. She doesn't go to parties or get drunk; in fact she doesn't even have any friends. Instead she opts to spend time with a comic book store owner named Vern; the pair get on well as they both love riddles and word games. However, these games take a sinister turn when Sara begins to notice that each time she solves a riddle someone dies... but who, or what, is behind these terrifying 'games'?