Shy Henry is overjoyed to fall into an unexpected romance with gorgeous and popular Samantha the summer after high school graduation. When Henry's love spirals into twisted obsession, Samantha pulls back.

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.