Season 4: Season 4

In the series’ most dramatic season yet, Cassie and Sunny investigate a cold case with alarming links to the police force when a corpse is discovered in a scrap yard, his features frozen in time. All four suspects have links to the law and attended the same police training course back in 1989. But who exactly is fighting for justice?

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Unforgotten

Episode 1

After making the decision to retire from the police force, Cassie faces a dilemma.

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Episode 1

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Unforgotten

Episode 2

Cassie and Sunny identify four potential suspects who trained as police officers together.

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Episode 2

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Unforgotten

Episode 3

Cassie and Sunny interview the four suspects, who all deny knowing the victim.

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Episode 3

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Unforgotten

Episode 4

Cassie and Sunny discover Walsh was chased by all four suspects on the night in question.

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Episode 4

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Unforgotten

Episode 5

Cassie and Sunny interview two of the suspects again and get closer to the truth.

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Episode 5

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Unforgotten

Episode 6

Despite a tragic turn of events, the team narrows down the suspects.

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Episode 6