The killer's next victim is a six-year-old girl, which devastates Marcella, and a DNA match gives the police team its strongest lead yet. Meanwhile, DI Tim Williamson investigates Andrew Barnes' death - was it really suicide?
Casts:
Anna Friel, Nicholas Pinnock, Ray Panthaki, Sinéad Cusack, Nina Sosanya, Jamie Bamber, Harry Lloyd, Ian Puleston-Davies, Robert Whitelock, Laura Carmichael, Charlie Covell, Jack Doolan, David Mallet, Maeve Dermody, Nick Hendrix, Patrick Baladi, Ben Cura, Tobias Santelmann