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"Moral Superiority" is the fourth episode in Series 4 of Line of Duty and the twenty-first overall episode. It was first broadcast on BBC One on 16th April 2017.

Summary[]

Roz's husband Nick is brought in for questioning by AC-12. But while Nick denies any involvement in Steve's attack, his suspicions about Roz mount. Meanwhile, AC-12 discover new anomalies in the forensic evidence and issue DCI Roz Huntley with a second Reg 15 notice. AC-12's case appears watertight until Roz starts dismantling their evidence with inside information of her own.

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