Annie Walker is after justice on Covert Affairs.

Burned by that traitor Lena, the CIA agent will make it her mission to trek to Russia on tomorrow night's "Let's Dance" - the final Covert Affairs episode until October 16 - and bring her former boss in.

But that endeavor won't simply affect Annie. Watch this clip from the installment to see the impact it has on Joan and Arthur:

As for what Annie will go in Russia? Play piano, of course...

This key Covert Affairs Season 3 episode airs on USA at 10/9c.

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