Consumed with envy and resentment, a woman becomes a nanny to her half sister's daughter and starts to wreak havoc on both of their lives.

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 beautiful Catherine interviews for a new job as a financial trader at a top investment firm, the CEO of the company, handsome Paul, hires her right in the room with an eye towards bringing her to the top. He also has his eye on romance and the two quickly begin to fall for each other, as Paul lavishes her with extra attention and gifts. Everything seems great… until the morning after a business party, when Catherine wakes up alone in Paul’s lavish mansion, and walks downstairs only to find the dead body of his ex-wife!