Will Blaylock died while on day release from prison.
It was a bad death. But accidents will happen.
Detective Sergeant McAvoy isn't convinced, though. And he owes a debt to Will's cellmate Owen Swainson: a debt formed in blood and fear when they came together to catch a killer.
But their search for a murderer will rip open old wounds, and force old enemies out of hiding...
David Mark spent more than 15 years as a journalist, including seven years as a crime reporter with the Yorkshire Post - walking the Hull streets that would later become the setting for the Detective Sergeant Aector McAvoy novels.
He has written four novels in the McAvoy series, Dark Winter, Original Sin, Sorrow Bound and Taking Pity. Dark Winter was selected for the Harrogate New Blood panel, a Richard & Judy pick and a Sunday Times bestseller. He is currently reader in residence for the Theakstons Old Peculier Crime Writing Festival.
He lives in Lincolnshire with his family, and you can find him on Twitter @davidmarkwriter.