In the wake of their first documentary's success, Peter and Sam seek a new case and settle on a stomach-churning mystery at a Washington high school.

Sam Maddox, a troubled girl whose father committed suicide, has earned a reputation at her high school for being a bit promiscuous. When Sam begins seeing brilliant, MIT-bound Henry Sinclair, the two opposites really attract. Although Sam doesn't realize it, Henry is in the grip of an insane romantic obsession, and he will kill anyone who tries to put an end to his star-crossed - and increasingly deadly - romance.

High school senior Wally Banks sells knives door to door and gets trapped in a man's house.