When did Castle Season 3 Episode 21 air?
Castle Season 3 Episode 21 aired on April 11, 2011.


A whole new chapter in crime solving.
After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.

When a champion swimmer and Olympic hopeful is found dead in a training pool, Castle & Beckett dive in to investigate his murder, and uncover myriad secrets that might have led to his death.
Direct answers for episode-level questions and details.
Castle Season 3 Episode 21 aired on April 11, 2011.
This episode runs for approximately 44 minutes.
Comments coming soon
Discuss episodes with other viewers