Halfway through the second episode, Susan, Lucy, Millie, and Jean attempt to track down neighbors or relatives that know their suspects. Susan and Millie discover a potential suspect, Gerard Wiggins, matches who they think the killer is: someone who has authority on the train way, and someone how knows routes by heart. However, they learn Wiggins has a brain injury that has severely impacted his intelligence. When the women finally meet up later, they learn that Wiggins was taken into custody as the police found evidence in his train station locker. Susan claims he could not do this. Knowing what they know now, Wiggins is simply a scapegoat for the killer and is not smart enough to kill in the pattern/way the killer does. As the group think about their next move, they remember the victims. All the victims were pretty young women. The group decides to take a risk--they want to use Lucy as bait for the killer on his most common train ...