A courier witnesses a teenage girl being attacked and dragged against her will into a van. Unable to stop the perpetrator, she calls the police. Irene and her colleague Jonny are sent to intervene but they arrive too late: the culprit has escaped and the young woman, who’s been savagely stabbed multiple times below the waist, dies in Irene’s arms. When another girl is discovered murdered following the same modus operandi, Irene knows she has to intervene fast as this extremely dangerous sexual predator is on the loose using online chat rooms to catfish and lure his victims.