Reckoning

(Part 2) The 12th Precinct and Castle try to stop Nieman and Tyson from claiming Beckett as their next victim. While Tyson captures Castle too, Castle reveals that it was a ploy to draw Tyson into the open where Esposito kills him with a sniper rifle. Using his phone, they track Nieman only to find Beckett escaped and killed her. At the end, Castle's ban is lifted and he is reinstated as Beckett's consultant/partner at the precinct.