Title: Kill Shot
Air Date: November 21, 2011 at 10:00 PM PST
A sniper on a killing spree is terrorizing New York City. With the clock ticking down to the next murder and nothing to go on except a killer with no apparent motive but to instill terror, this could prove the team's toughest case yet.
The hunt is made even more complicated when Beckett begins to experience increasingly strong moments of PTSD — moments she tries hard to hide from Castle and the detectives