Episode 1

Can DS Marcella Backland separate her professional and personal life, as she strives to catch a killer while her family falls apart?

Episode 2

Marcella tries to piece together what unfolded at Grace's - is it something to do with her disappearance? The team continues to hunt the killer. Could it be the same person that Marcella suspected all those years ago?

Episode 3

Marcella is terrified after a tragic discovery - was she involved? When a young girl on the take gets in the killer's way, can Marcella keep her safe?

Episode 4

An aborted attack on an old man gives the police a new lead in the Grove Park killings. Marcella tries to track down the taxi driver from outside Grace Gibson's house, fearful that he saw her on the night of the murder.

Episode 5

Marcella continues her search for a serial killer and gets more information about Grace and her husband's ties to her.

Episode 6

The killer targets a six-year-old girl, which devastates Marcella, but a DNA match gives the police team their strongest lead yet.

Episode 7

Mo confronts Marcella, and Jason and Tim clash when he starts to investigative the curious circumstances surrounding the death of Andrew Barnes.

Episode 8

In the desperate hunt for Matthew, Marcella questions Henry at his home. The pressure mounts on Jason as Tim's investigation gets closer to the truth.