Castle Season 6 Episode 21
#A whole new chapter in crime solving.
Watch Castle Season 6 Episode 21 Online. 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.
- Genre: Drama, Crime
- Country: United States
- Director: Andrew W. Marlowe
- Cast: Nathan Fillion, Stana Katic, Molly C. Quinn, Jon Huertas, Seamus Dever, Susan Sullivan, Tamala Jones, Toks Olagundoye,
