Here's the official guide of NCIS: Los Angeles season 4 episode 14 "Kill House" --- airing on Tuesday, Feb. 5th on CBS.

THE NCIS: LA TEAM GOES UNDERCOVER AS AN ELITE OPERATIONAL UNIT IN ORDER TO INVESTIGATE A CRIME LINKED TO CARTELS AND TERRORISTS ---

• Callen, Sam, Kensi and Deeks go undercover as an elite tactical force in order to investigate an ambush tied to a cartel kingpin with terrorist connections.

Source: CBS