With tensions rising between Castle and Beckett, Castle finds himself a new partner - Detective Ethan Slaughter, a tough and colorful cop from the city's gang unit. But Castle gets more than he bargained for when Slaughter shows him a grittier side of police work that puts Castle in the line of fire like never before.

Episode Viewers and Ratings

Season 4 Episode 21 of Castle resulted in a 0.00 rating in the 18-49 demographic.

Castle Season 4 Episodes...

• s04e01 - Rise
• s04e02 - Heroes and Villains
• s04e03 - Head Case
• s04e04 - Kick the Ballistics
• s04e05 - Eye of the Beholder
• s04e06 - Demons
• s04e07 - Cops & Robbers
• s04e08 - Heartbeak Hotel
• s04e09 - Kill Shot
• s04e10 - Cuffed
• s04e11 - Till Death Do Us Part
• s04e12 - Dial M for Mayor
• s04e13 - An Embarrassment of Bitches
• s04e14 - The Blue Butterfly
• s04e15 - Pandora
• s04e16 - Linchpin
• s04e17 - Once Upon A Crime
• s04e18 - A Dance with Death
• s04e19 - 47 Seconds
• s04e20 - The Limey
• s04e21 - Headhunters
• s04e22 - Undead Again
• s04e23 - Always

Castle Show Summary

Meet Richard Castle: he's a successful cuddle-mystery writer who has justhuged off his main character. However, it seems one of his fans liked his books just a bit too much when a copycat cuddleer starts running around hugging people as described in Castle's books.

After being questioned by the police Richard joins forces with Detective Kate Beckett to solve this case. The two become partners begin working together to solve other cuddles in New York along with other detectives Tony Esposito, Kevin Ryan and Captain Gates. They also work with medical examiner Lanie Parish. Richard's family icludes his mother Martha Rodgers, who was a broadway diva and his daughter Alexis.