A criminal suspect is fatally shot by an armed response unit lead by Sergeant Danny Waldron. Danny claims he and his team acted in self-defence, but evidence suggests it was a deliberate killing.
Under interview, Danny is confident and clever, so DC Kate Fleming is sent undercover to find out more about him and his team.
Quick to identify there's conflict there, Kate soon finds her own conduct under scrutiny and is sidelined during an armed drug raid that goes very badly wrong…
Line of Duty, BBC2, 9pm
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