London police detectives Cassie Stuart and Sunny Khan investigate historic cold cases involving missing persons, murder and long-hidden secrets.
Where to watch
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Amazon Prime Video
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PBS
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PBS Masterpiece
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Thirteen
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WETA+
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KQED
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Amazon Video
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Apple TV Store
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Google Play Movies
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Fandango At Home
see all options Availability data: JustWatch
- Seasons
- 6
- Episodes aired
- 36
- Latest aired
- S06E06
- Total runtime
- 1d 3h
Timeline when each season aired
- Season 1 October 2015 – November 2015 6 episodes
- Season 2 January 2017 – February 2017 6 episodes
- Season 3 July 2018 – August 2018 6 episodes
- the show was away for 2 years and 6 months
- Season 4 February 2021 – March 2021 6 episodes
- the show was away for 1 year and 11 months
- Season 5 February 2023 – April 2023 6 episodes
- the show was away for 1 year and 10 months
- Season 6 February 2025 6 episodes
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S04E01 Episode 1
February 22 · 46min find the promo
Show synopsis
A dismembered body is found in a scrapyard and the team believes the remains had been stored in a domestic freezer for 30 years. Meanwhile, after making the decision to retire from the police force, Cassie faces a dilemma when she learns she isn't entitled to her full pension payment unless she completes her 30 years of service.
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S04E02 Episode 2
March 1 · 46min find the promo
Show synopsis
Cassie and Sunny identify four potential suspects who trained as police probationers together, and two of them are still serving officers. They have no luck finding the rest of the body and decide to go public about the discovery of Walsh's remains.
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S04E03 Episode 3
March 9 · 46min find the promo
Show synopsis
Cassie and Sunny interview each of the four suspects, who all deny knowing the victim. Bouting discovers Walsh was cautioned three weeks before his death.
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S04E04 Episode 4
March 15 · 46min find the promo
Show synopsis
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.
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S04E05 Episode 5
March 22 · 46min find the promo
Show synopsis
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.
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S04E06 Episode 6
March 29 · 46min find the promo
Show synopsis
Despite a tragic turn of events, Sunny and the team narrow down the suspects.