BEHIND THE SCENES

CASTLE – “The Human Factor” – When Homeland Security inexplicably seals the crime scene of a car bombing, Castle and Beckett find themselves with two mysteries on their hands: who murdered the victim, a government whistleblower, and why are federal agents trying to take over the case? The plot thickens when they discover that the victim wasn’t killed by a car bomb but by a missile from a military drone, on “Castle,” MONDAY, MAY 6 (10:01-11:00 p.m., ET) on the ABC Television Network. Carlos Bernard guest stars as Jared Stack, a mysterious operative who may hold the key to solving the case. (ABC/Richard Foreman)