When Sally Walker opens her door one day to a stranger, her life changes forever. The woman informs her that she is having an affair with her husband and is pregnant with his child. When Sally confronts her husband, he denies everything and claims that the woman is both deranged and dangerous. Can she trust him? When her husband vanishes, Sally sets out to find out the truth but the consequences of this search ends in a fight for life and a secret that she can never reveal.