This time, it's Karmen Naylor, estranged daughter of a south London crime boss, fighting a murder charge and desperate to be believed.
But Benson becomes trapped into a grudge match between two rival clans, endangering himself and those he loves.
Tess de Vere is by Benson's side but she's keeping something from him. A stranger on the trail of a state-sanctioned death squad operating in Northern Ireland during the Troubles brings a terrible secret into the heart of her own life. And he won't go away.
Can Tess and Will find their way through all the secrets and the lies? Should justice always be served - and if so, at what cost?