Detroit single mother Harvette Williams has no idea that she's inviting an obsessive stalker into her life when she gives her business card to a one-time acquaintance, Kevin Gary.

After 2 years of dating, police officer Amy Johnson happily marries Corrections Officer Dustin Hall, but over 6 years of marriage, he becomes a different man. She's troubled by her husband's mood swings and controlling behavior, but when she finds a suicide note he has written on her behalf, she fears for her life.

Single mother Karen Welch gets a mysterious call on Christmas Eve. At first, she thinks nothing of it, but then starts getting dozens every day after, follow Dr. Ward through this game of cat and mouse.

In 1996, outgoing Cameron Wallace befriends shy geeky Ryan Clutter in a high school art class. Ryan soon becomes obsessed with her, and little does she know that Ryan will stalk her for the next ten years.