Season 1

After 3 years of emotional abuse, Peggy Klinke breaks if off with her boyfriend only to have him begin watching her every move. Police offer little help, so Peggy takes matters into her own hands.

When Mary and her family move to the quiet D.C. suburbs, she finds a new best friend in her neighbor Jane. After Jane physically becomes Mary's copycat and starts spying on her, Mary ends their friendship and is promptly accused of child abuse, then attempting to run Jane over.

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.