Ben Conrad, the perfect profile match thrown up by the FBI computers in Tick, Tick, Tick…, turns out to be bait dangled by the real killer, Scott Dunn, and like leaping trout Beckett's team and the FBI team both gulp down this dancing, delightful lure. Only when Castle spots the discrepancy in the crime scene photos - that the gun changed hands between the window and the floor - does Conrad lose his luster, and bear closer examination.