On a frozen Bristol night, a missing young woman's walk home is captured on flickering CCTV. When her body is found, the hunt for a killer turns a quiet street into a labyrinth of suspicion, where the most dangerous person may be the one living next door.

When the murder of a young woman points police to a quiet church handyman, detectives uncover a serial killer hidden in plain sight for decades, linked to multiple killings across the U.K.