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While investigating the murder of a newspaper columnist, Sam crosses paths with a dangerous killer from one of his cases in the future and is convinced that he is guilty of this crime.
The precinct goes into lockdown when a councilman is shot and killed in the station. But before he is killed, the councilman tells Sam that he is from 2009 and that he has found a way to get back home.
A group of radicals is targeting police officers with their bombings, and Sam suspects that Lt. Hunt will be the next target.