NCIS: Los Angeles: Season 2, Episode 2

2 - 2: Black Widow

An NCIS undercover agent is assassinated while in Cyprus investigating illegal arms sales to Chechen extremists. The same hit team is later detected arriving in Los Angeles, and the NCIS LA team is on a race against the clock to stop the assassins from killing their next target, a suburban housewife who's more than she appears to be.