Unforgotten on MASTERPIECE continues. In the series' most dramatic season, Cassie and Sunny investigate a cold case with alarming links to the police force. Can the force ever really be trusted, and will Cassie and Sunny find themselves on the wrong side of the law? Tonight: Cassie and Sunny discover Walsh was chased by all four suspects on the night in question. The pathologist identifies a cause of death implying Walsh was murdered.

Kep up with the story tonight at 9pm on GBH 2.


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