Your Crimes Are Quiet, My Love (Ziam AU)

This is not my story. It is written (and cover) by lightswoodmagic (sarah_writes) on AO3. Zayn and Liam have been best friends for years. What happens when their feelings start to change? Did I mention that they are MI5 agents with a serial killer on the loose? Oh, and one of them has to go undercover to participate i...