Season 4 | Episode 415 | Aired 02/13/2012
Despite the objections of another operative, Martin Danberg, Sophia asks Castle and Beckett to covertly continue their search for Thomas Gage. He’s all for it. She’s a little uneasy about keeping secrets from her team. Beckett also admits to being taken aback by the fact that her partner “researched” with someone else before her. Castle assures her that Nikki Heat is a far more complex, nuanced character.
Tracy McGrath was a climate scientist with a PhD in applied mathematics. Castle and Beckett find her classic GTO in a long-term parking garage in Jersey. They discover a briefcase in the trunk containing a military grade spy phone and scrambler. Before they can check the last number dialed, Thomas Gage disarms Beckett with a nifty Jason Bourne-like move. He locks her in the GTO’s trunk with Castle. On the bright side, at least they aren’t handcuffed this time.
Castle pressed the panic button Sophia provided on his cell phone just before Gage smashed it. Beckett doesn’t want to wait for his “girlfriend” to rescue them. She digs around under a writhing Castle to find a tire iron to pop the truck. When they reach the outside world, a CIA operative is waiting for them with those stylish pitch black hoods.
Back at the CIA bunker, Beckett seems disconcerted as Castle and Sophia fall into an investigative rhythm. The team learns that the person Tracy called is Dr. Martin Blakely, a mathematics professor who consulted for the agency. The guy was believed to have died in 2002. Agent Danberg says that Blakely specialized in something called a linchpin theory. He’d find a small event that would trigger a larger event. The domino effect would cause cataclysmic results.