Catching up on Unforgotten?

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Season 4
Despite a tragic turn of events, Sunny and the team narrow down the suspects. Will they find conclusive proof of who the murder weapon belonged to and succeed in bringing Walsh's killer to justice? (Final)
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. Unexpectedly, things take a devastating turn for Cassie.
Cassie and Sunny discover Walsh was chased by all four suspects on the night in question. Willets realises Fiona's blood sample may have been deliberately lost by Liz. The pathologist identifies a cause of death.
Cassie and Sunny interview the suspects, who all deny knowing the victim. Boulting discovers Walsh was cautioned 3 weeks before his death and believes it was with Ram, while Collier manages to locate the rest of Walsh's body.
As Sunny and Cassie investigate, they find that a graduating class of police officers could all be connecting to the case - some are still serving in the force.
A corpse is discovered in a huge scrap yard. With Cassie and Sunny on the case, four murder suspects quickly emerge. The suspects have just one thing in common: they've all got connections with the law.
Season 3
Cassie and Sunny finally get closer to some truth about the night Hayley disappeared and the case takes a devastating turn for Cassie.
Cassie and Sunny realise the men all lied about that night and a mistake that Cassie made has devastating consequences for one of the suspects.
Cassie and Sunny begin interviewing the four male occupants of The Spinney over the millennium, while the rest of the Bishop Street Station team look at the timelines and leads from the original investigation.
The search for what happened to Hayley begins as the team travel down to Middenham to meet her family.
Under the glare of media spotlights, the team race to find the evidence to prove the identity of Hayley's killer. (Final)
When human remains are found buried in the central reservation of the M1. Cassie and Sunny begin the task of identifying them.
Season 2
With their victim identified, Cassie & Sunny begin to find out more about David Walker by talking to his ex-wife, DI Tessa Nixon. A search through the original investigation files helps lead them to a few potential suspects.
Nicola Walker and Sanjeev Bhaskar return as detectives Cassie and Sunny, who find themselves thrown into another historic murder case. This time it's the perfectly preserved remains of a middle-aged man found in a suitcase.
With the suspects in the murder of David Walker all having either a motive, opportunity or connection to the victim, Cassie and Sunny are left with a massive puzzle to solve. (Final)
Cassie turns her attention to Brentford house and the theory that one or more of the suspects may have been abused there. Marion is questioned again after Sinead's allegation that David could have been an IRA target.
Marion jeopardises her marriage by refusing to open up about the past to her husband, Colin is blackmailed even further and the secrets of Sara's past push her family to breaking point.
Sunny makes further investigations into David Walker's life that suggest he was a troubled man. Marion has a chat with Cassie about her past and the inquiry reveals her close relationship with an IRA activist.
When the body of a young man is discovered in a derelict building, DCI Cassie Stuart - one of the Met's smartest detectives - is called in to investigate with her partner DI Sunil Khan.
Father Robert's revelations have lasting repercussions; things get more difficult when Caroline goes into premature labor. Bella & Josh deliberate over how to deal with their father & the search for Lizzie continues. (Final)