Chasing Shadows is a thrilling, new four-part ITV drama, set in a missing persons unit that hunts serial killers. Reece Shearsmith plays DS Sean Stone and his partner, Ruth Hattersley is played by Alex Kingston, whilst Noel Clarke 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. Sean's new caseload is overwhelming - up to 300,000 people go missing in the UK each year - but his brilliant mind turns out to be perfectly adapted to his new role. Where others see a hopeless, ever-growing sea of lost faces, Sean spots patterns, that lead to victims... and their killers. 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 breaking point. DI Prior has ambitions and a clear plan for rising up the ranks. But all this is jeopardised when DS Stone becomes his responsibility.