With tensions rising between Castle and Beckett, Castle finds himself a new partner -- Detective Ethan Slaughter (guest star Adam Baldwin, "Firefly"), 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
| Creator | Andrew W. Marlowe |
|---|---|
| Actor | Nathan Fillion, Stana Katic, Molly C. Quinn |
| Country | United States of America |
| Production | Beacon Pictures |