When DCI Matilda Darke receives a mysterious telephone call, she immediately dismisses the threat. After all the Homicide and Major Enquiries team are a regular target for prank calls. But ignoring this warning might soon be the biggest regret of Matilda Darke’s life. A lone gunman is on a deadly rampage around Sheffield, leaving a bloody trail in his wake. Taking his shots with a sickening precision, he’s about to leave his mark on the world and change Matilda and her team’s lives forever.