Maddie, a local reporter investigating a series of killings targeting similar looking women is caught off guard when her younger sister Olivia, is attacked in her own home. Urging on the side of caution, Maddie suggests they take a self-defense course. When Olivia starts to fall for their instructor, Maddie becomes skeptical when he refuses to reveal anything about himself, and tries to intervene before the relationship turns into a deadly obsession.
When Nicole Atkins returns to graduate school, a previous affair with a married professor is the last thing on her mind. However, someone else on campus has his eye on Nicole, someone who knows all her secrets.