Samantha Leiffer is trying to get a grip on reality. Her live-in boyfriend, detective John Krull, isn't deeply troubled, he's just quiet. Her ex isn't a stalker, he's just trying to be friendly. And the nerdy stranger who gives Sam a note warning her of danger unless she calls him, is just hitting on her-until one by one, people vaguely connected to her start getting killed. Now Sam knows she's not imagining the murderer-and that he's closer than she thinks.