Adam Ferranti was a talented American journalist, who moved to England to escape the issues surrounding his fall from glory at the Washington Post; only to be thrust back in it when a mysterious serial killer makes him his confidante.
DS Stephanie Walker is a member of the West Yorkshire Police.
Whilst tough and results-driven at work, she hides the abuse she suffers at home.
She finds Ferranti annoying but he's her only chance to stay close to what the killer is planning next.