Siobhan Finneran, Katherine Kelly, and Nadine Marshall to Star In Upcoming ITV Thriller 'Protection' Siobhan Finneran, Nadine Marshall and Katherine Kelly are all set to star in ITV's upcoming six-part thriller Protection, a series based on the first-hand experiences of a long-serving witness protection officer. By Lacy Baugher for ITV on 12/31/2023