NCIS: Los Angeles took viewers back a couple decades this week, sort of re-enacting the Cold War by revealing that Russia was behind the theft of highly sensitive information.

The installment featured Callen and company going through an investigative maze that led them from one suspect to another and another… with few clues being left along the way.

This made the opening half of NCIS Los Angeles Season 5 Episode 8 a bit tiring to watch, but the action picked up in the final 30 minutes.

In what way? Click on this picture of Callen to watch the installment in full and find out:

Watch NCIS: Los Angeles Season 5 Episode 8

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.