Richard Castle and Kate Beckett in Castle Season 4 Finale, "Always"
When the murder of an Army veteran puts Beckett on the trail of the man who shot her, Castle must decide how much he's willing to sacrifice to keep her safe. As secrets are revealed and feelings are put on the table, the lives of the detectives at the 12th Precinct may never be the same.
Original Air Date: Castle Season 4 Finale, "Always" airs on Monday, May 7, 2012 at 10 p.m. ET on ABC.