Episode list

The unit is stunned when DI Martha Bellamy is murdered in her own home. DCI Daniel Drummond leads the investigation, bringing in officers from Major Crimes to help - but someone knows more than they are letting on.

A new murder victim is linked to the Bellamy blackmail case forcing Jack to pressure his old flame into testifying against her boyfriend, who Jack thinks is responsible for the blackmail and Martha's murder.

Alisha and TDC Gary Roscoe are called out when 16 year old Kia Hopkins reports that she was raped after being at a party with Rose Harris's daughter Lucy though Charlie is shocked when Jack admits he has been putting up the girl he believes to be his daughter at his flat. Kia tells Alisha that she was drugged and cannot recall events but evidence points to the rape taking place in a car belonging to her father Archie and the culprit being a boy known as CJ. Matters are complicated when Kia's foster brother Nico is also involved and when Lucy is implicated in an attack on CJ Charlie is forced to tell Alisha about her relationship to Jack. Given time off Jack returns home to find Lucy has been abducted.

Investigating Lucy's disappearance the team learn that the blood stains at the flat are those of Gus Adebayo, the bouncer at Mo Jones' club but when arrested he claims to have no knowledge of Lucy's whereabouts. Following an appeal schoolboy Jimmy arrives at the police station, stating that he is Lucy's boyfriend and, after Gary's sensitive interview, admits to being sexually abused by Stan, a fact that he told Lucy. The girl is found but Mo takes a terrible revenge on his brother and Drummond helps him hush it up, swearing Jack to secrecy though Gary suspects that there is something wrong.

The body of Sarah Kramer, who went missing eight years earlier is found and Jack interviews her widowed father Joseph, who tells him that Martha had been investigating the disappearance. Retired officer Ed Goddard, no friend of Drummond, reports to Gary that Sarah was an informant and Drummond her handler and secret lover whilst Jack also lets Gary in on Drummond's confession regarding Stan's death. Drummond covers himself to the team, throwing suspicion on Mo as the object of Sarah's investigation and her killer, to which he admits but adds that Drummond buried her body. Alisha and Jack have to prove it.

Alisha obtains evidence to incriminate Drummond from his wife Chrissy and, after she is attacked and it is stolen, its recovery proves that Drummond's son Luke was the attacker. Realizing that the game could be up for him Drummond goes to see Joseph and asks him to keep a secret. The connection between Joseph, Mo Jones and Drummond will eventually solve the mystery as to who killed Sarah, and Martha and her husband and bring Drummond down.