Pursuing what she hopes will be a positive relationship with new boyfriend Patrick, hypnotherapist Ellen learns that his ex-girlfriend is stalking him, a situation that Ellen finds professionally fascinating before discovering the woman's identity.

After a couple invites a friend to move into their new house to share expenses, the friend invites his new girlfriend to stay as well and she becomes obsessed with making the house into her own home.

After being terrorized by a stalker, a woman is unwillingly committed to a mental institution and believes that her stalker is following her inside the hospital.