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.
When an ex-con is mysteriously slain in an alley, Castle and Beckett believe a vigilante is behind the murder.
Castle and Martha are held hostage during a bank robbery that turns out to be anything but routine.
A special recap of "Kill Shot."