A serial rapist haunts Lamona and Dr. Carmen Carillo is right in the middle of hunting down the perpetrator. As she goes about her business evaluating accused sex offenders, Carmen stumbles into her own gruesome attack. As she recovers, she discovers a possible plot against her coming from prisons in Alaska, Nevada, and Montana. Never willing to leave the work to the authorities, Carmen sets out on a mission to avenge her attack and discover the frightening truth about this horrible offender. If Level III is supposed to be the worst kind of sex offender possible, what happens if the man terrorizing women in Lamona is a Level IV?