Can DS Marcella Backland separate her professional and personal life, as she strives to catch a killer while her family falls apart?
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?
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?
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.
Marcella continues her search for a serial killer and gets more information about Grace and her husband's ties to her.
The killer targets a six-year-old girl, which devastates Marcella, but a DNA match gives the police team their strongest lead yet.
Mo confronts Marcella, and Jason and Tim clash when he starts to investigative the curious circumstances surrounding the death of Andrew Barnes.
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.
A quick round-up of the story so far, ahead of the second series.
The discovery of a young boy's body sets Marcella and the team on the hunt for a child killer.
Marcella decides to return to the root cause of her blackouts. Meanwhile, the discovery of another body leads the team to question what type of killer they're dealing with.
Marcella needs to take control of her blackouts urgently or risk losing her children - and her pursuit of Phil Dawkins has tragic consequences.
Phil enacts his revenge against Marcella as aging rock star Reg toys with the idea of coming clean.
Marcella learns the horrifying truth about the scale of the killer's crimes when she discovers the murderer's lair.
The arrest of Vince Whitman causes massive fallout between Tim and Marcella. Meanwhile, Postfeed24's internet viral video leads the team to discover another body much closer to home.
Having discovered a key fact about the killer, Marcella returns to Nigel Stafford's home to uncover the truth behind his false allegations about Vince, but the truth leads to tragedy for the team.
An arrest leads Marcella to Gail's workplace, but what awaits her is truly dreadful.
Marcella is working deep undercover investigating a crime family in Belfast.
Rav heads to Belfast to investigate Bobby while Marcella delves deeper into the Maguires' criminal world.
Rav discovers Marcella is working undercover. Tough-guy Jack is released from prison and rejoins the Maguire family. The fallout from Jessie's death ripples through the community.
Marcella's mental state is beginning to fracture. Bobby is arrested and Katherine takes control of the city by getting rid of those in her way.
Marcella investigates the truth about Bobby. Trying to track down her own stalker leads to a shocking truth. Stacey attempts to escape the family with her baby.
We discover the origins of the Keira persona in flashback, and Marcella realises the extent to which her past is still haunting her.
Marcella cuts ties with her old life as she engineers to become the centre of the Maguire family with Finn. Meanwhile Marcella's old conscience continues to threaten her.
The showdown: The fault lines Marcella has set in motion within the family reach crisis point, whilst our heroine confronts the ultimate choice regarding her identity, and her future.
