Blue Line, Red Line

You are John Jones, Detective Inspector, Cardiff CID. 

Dark, violent things have been happening recently in Cardiff and you're here to run Special Investigations before setting up a Serious Crime Unit.

Your cases are full of misery, and unsolved. 

Can you tie all the loose threads together?

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Content warning: 

Profanity, vampirism, mind control, descriptions of violent crime, blackmail and coercion, memory loss.

For mature readers only.