After a concerned neighbour knocks on Janet’s door, she can only guess at the horrors about to happen. Rachel wishes she was still single while Janet ends up realising that her own marriage is over.

After businessman Adam Armitage pushes a homeless man, he doesn’t know that he’s killed him, so what is the reason why is he running away? Rachel gets married to a happy Sean, and Janet admits her marriage is over.

The detectives investigate the murder of a wealthy man whose double life left him vulnerable to exploitation. Away from work, Rachel's recent moment of indiscretion threatens to come back to haunt her when a confused Sean takes a phone call from her one-night stand, and after Ade is pushed into living with his girlfriend on a permanent basis, Janet asks her mother to move in.

Having witnessed her father Joe being arrested for the murder of her mother Eunice, Helen shows up at Janet’s door saying that she believes her brother Michael might be buried in the cellar of the family home. Ater the remains of a second body are discovered, the case becomes much more serious and Det. Supt. Dodson is drafted in as the S.I.O, with Gill as her deputy.

Having discovered the remains of several bodies, Gill and Dodson’s teams need to try and identify them, and attempt to piece together the order in which they were murdered. Joe Bevan remains tight lipped though. After the remains of a teenage girl are found in an upstairs room, Helen is faced with the possibility that her dad killed both her brother and her sister.

The team investigate the suspicious death of care home resident Gerald French after his daughter Catherine raises some concerns about the level of care her father had been receiving. Shy trainee Rosie is seen slapping a resident and she is upset to discover that her mentor doesn’t have her best interests at heart.

The team investigate the murder of a man whose body is discovered shortly after he is reported missing by his son. Rachel's self-destructive behavior leads to a falling-out with Janet, and forces Sean to realize that his marriage is over.

Janet and Rachel’s friendship has been ruined. Janet attempts to stay professional, but the lack of communication between them makes things difficult. A call from MIT Command, alerting the team to Gill’s disappearance, forces Scott and Bailey to put their differences aside and work together.