Not a single murder is depicted in the film's entire running time, despite the fact that every single character is a serial killer.
This film was originally intended to be a minor subplot in The Ritual (2009). However, Anthony Spadaccini liked it so much that he decided to make it a separate film.
The events in this film run concurrent to the entire Head Case (2007) series (Head Case (2007), The Ritual (2009), Post-Mortem).