Castle S4E21: Headhunters
- Aired: 2012-04-16
- Time: 22:00:00
- Runtime: 60 minutes
Overview
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.