The storyline follows Elise Wasserman and detectives Karl Roebuck working to find a serial killer who left the body of a French politician and also the lower-half of some prostitute that is British at the mid point between the UK and France, in the Channel Tunnel. Then they learn that the killer--who has been known as the"Truth Terrorist"--will be really on the moral crusade to highlight many societal problems, terrorising both countries in the Procedure