Can Sunny, Jess and the team bring the clues in the case together and unravel the secrets to solve it?

Despite the trouble in their personal lives, Sunny and Jess attempt a reset as they follow the clues in the case.

Sunny and Jess's personal lives go from bad to worse while they struggle to keep focused. Meanwhile, the suspect list grows and a mother and son are put under the microscope.

The victim's turbulent past comes to light. While Sunny takes a trip to Paris and Jess drops in on an unsuspecting Lord, the pair continue to butt heads.

The team work to identify the body found in the chimney flue as forensics reveal the cause of death. Jess and Sunny visit the victim's mother to break the devastating news. They find the pair had a tumultuous relationship.

When a severed leg is discovered inside a chimney the team get to work identifying the victim. Cassie's replacement has a rocky start as she clashes with a grieving Sunny.

Cassie and Sunny interview two of the suspects again and get closer to the truth of what happened to Walsh. Balcombe believes she may have found the cause of death.

Cassie and Sunny discover Walsh was chased by all four suspects on the night in question. Willets realizes Fiona's blood sample may have been deliberately lost by Liz.

Andrews is still unconvinced that there is enough evidence to tie four police officers to the Walsh murder.  But with Fogerty dead, Cassie believes the only way to determine the truth is to interview the passengers of his car on the night in question.

Cassie and Sunny identify four suspects who trained as police probationers together; two of them are still serving police officers.

When a headless and handless body is found in a North London scrapyard, the team led by Sunny are called to investigate. They suspect the body was illegally dumped, perhaps transported inside a white goods item. This is confirmed when pathologist Leanne B

Cassie and Sunny call James, Tim and Chris back for further questioning following the revelation that they have all lied about their whereabouts on the night of Hayley's disappearance. With Pete having said he saw Eliot climbing back into the holiday home

It becomes clear that the four male suspects have colluded in lying about their version of events on the night Hayley went missing. Jake speaks to Tim Finch's ex-wife to hear her version of events and the team uncover some disturbing information about Chr

Peter, Chris, James and Tim are all interviewed by Cassie and Sunny about the time they spent renting a holiday cottage near where Hayley disappeared over the turn of the millennium. James is the first to be called in, and reveals that Tim and Chris both

Cassie, Sunny and the team travel to Middenham to meet Hayley's parents and twin sister, Jessica. The press are already circling in the area and it's clear that unearthing Hayley's body will bring the whole investigation back into the media spotlight.

With each of the suspects having a motive, opportunity or connection to victim, Cassie and Sunny try to join the dots to discover who actually killed him 25 years earlier.

Cassie turns her attention to investigating the goings-on at the Brentford house and the theory that one or more of the suspects may have been abused at the gatherings that took place there.

Sir Phillip makes a difficult decision in order to protect his family and salvage what is left of his reputation. Father Robert comes clean to his family and the police.

The investigation into Jimmy's death continues with the discovery of marks on his body consistent with known gangland torture methods.

Cassie and Sunny pay a visit to Father Robert Greaves, who remembers Jimmy fondly, but is unable to help identify the mysterious 'Jo-Jo' the person who it appears gave Jimmy the diary.

Having identified the body in the cellar as Jimmy Sullivan the search for his murderer begins, Cassie and Sunny investigate, starting with identifying the names featured in Jimmy's diary.

A skeleton found in the cellar of a building being demolished prompts investigation from DCI Cassie Stuart and her colleague DS Sunny Khan into the murder of a young man that could potentially span back thousands of years.