Castle and Beckett race to find the "Linchpin" in order to stop the first domino in a chain of events which will plunge the United States into war.
Episode rating
Cast of episode
76
20
1
1
- Kate Beckett
- Richard Castle
- Javier Esposito
- Alexis Castle
- Kevin Ryan
- Lanie Parish
- Martha Rodgers
- Captain Victoria Gates
- Sophia Turner
- Martin Danberg
- Thomas Gage
- Janacek Spivey
- Chess Player
- Jones
- Tech #2
- Tech #3
- Agent Jack Corrigan
- Agent Trahn
- Super