Chasing Shadows is a thrilling, new four-part drama set in a missing persons unit that hunts serial killers. Reece Shearsmith (The Widower, Inside Number 9) plays DS Sean Stone and Alex Kingston (ER, Doctor Who) stars as his partner, Ruth Hattersley, while Noel Clarke (Star Trek Into Darkness, Doctor Who) takes on the role of DI Carl Prior. Sean is intense and socially awkward, a misfit who is happier dealing with data rather than people. His lack of people skills and forthright honesty make him some powerful enemies in the force and he finds himself exiled to Missing Persons. Ruth is the analyst from the Missing Persons Bureau tasked with working alongside Sean. She puts people first—a born connecter able to get on with anyone, but Sean pushes even her patience to the breaking point. DI Prior has ambitions and a clear plan for rising up the ranks, but all this is jeopardized when DS Stone becomes his responsibility.