ark claims he threw the first punch, so Luther is released. He blames Alice for setting him up and she rapidly becomes an irritating, patronizing stalker. Meanwhile, a sniper is killing police officers all over London and ex-marine Owen Lynch, wounded in Afghanistan, and whose father Terry, another ex-soldier, is in jail for killing a police man, sends Luther's office a video tape claiming responsibility. Luther believes the father has ordered the son to do it to get his case re-examined but Terry refuses to call his boy off. Luther stages a television interview reviling the Lynches so that Owen will be forced into a confrontation.

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