Closer (to God)

Se7en/The Girl with the Dragon Tattoo AU-ish.
Political journalist and editor, Erik Lehnsherr, has just lost £150,000 in a libel case against businessman, Kurt Marko. Down on his luck and in need of money, Erik is approached by the Metropolitan Police’s Detective Inspector Charles Xavier. Well-known for his investigative journalism, Erik is asked to help in the search for a serial killer in return for £200,000 if the killer is caught.
Wrapped up in murder, religion, and sex, Erik gets more than he bargained for.