The three cases the pathologists have been dealing with converge. They soon have a fourth case when Shannon's friend Amy is found in a locked room, dead from asphyxiation in a fire. Shannon, Kelly and the tattooed man all shared the same staph infection, while the tattooed man's body was found near the flat where Amy died. The girl in the suitcase is identified as Megan Reid, who happened to go to the same school as Shannon. They quickly piece together what has been going on but finding a victim willing to identify the men will not prove easy.
—garykmcd