Supermarket shelf stacker Regina Steps has been strangled, stripped to her underwear, and her body forced into a gruesome position atop one of the cannons of Derry's historic city walls. For seasoned DI Liam McLaughlin and his ragtag team from the Serious Crimes Branch, it's a murder they've never seen the likes of before. Middle-aged Regina might have kept herself to herself, but she always had a smile for everyone she came across. Who could...