When Beckett is assigned to protect Erik Vaughn, a billionaire entrepreneur whose colleague was murdered, she can't help but be charmed by this dashing genius. Meanwhile, consumed with jealousy, Castle does everything he can to solve the case to get Vaughn out of Beckett's life.

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.