Catch the train if you dare...
Against her wishes, Walker\'s boss brings in officers from another force to help the investigation and prevent more deaths, but she\'s forced to defend her team against this outside interference..
After a teenage boy is found dead on a Lenchester train, Detective Chief Inspector Whitney Walker believes they\'re being targeted by the notorious Carriage Killer, who chooses a local rail network, commits four murders, and moves on.
Catch the train if you dare..