The future of the team is threatened and without having that to deal with, Sandra has to take drastic measures to prevent Jack from exacting revenge against the man who killed his wife Mary. Sandra also has the added benefit of trying to keep Jack’s actions from shady new recruit DCI Karen Hardwick while working on a 10-year-old murder case.

Sandra's private and professional worlds become intertwined when her mother has a fall and goes into a care home - but the establishment is revealed to be a scene of a suspicious death a year earlier.

When an armoured van is discovered at the bottom of a lake, the team makes a link with the murder of a women 17 years ago.

A family feud erupts when a rich and lonely old woman, Dorothy Hepple, is found dead in her home.

The team reinvestigates the 1950s murder of a young wages clerk at Battersea Power Station.

When Brian's dog finds a body, it prompts two people to confess to murder. It turns out that the body is over 600 years old, so Sandra, Jack, Brian and Gerry must discover why the pair took responsibility for a crime they couldn't possibly have committed and if they are the perpetrators of other killings.

When a camera and film belonging to a photographic lab assistant murdered in 1987 are found in a Soho pub toilet, the team reopen a 20-year-old case.

The news that Sandra's father, a DI, killed himself while under investigation for corruption, throws into doubt everything she believed in.