The mind of Carrie Matheson. It can be a scary, confusing place.

And, as we head into Homeland Season 2, it will be the focus of this Emmy-nominated Showtime drama. How much does Carrie remember about Brody and the events that concluded Season 1? What sort of effect will shock therapy have on her already-unstable brain?

The latest Homeland trailer forces us to wonder about these answers, while hinting that Claire Danes' ex-CIA agent won't be in the dark entirely when the series picks back up on September 30. Watch now:

Earlier this month at Comic-Con, a sneak preview of the season ahead teased Carrie's new position at professor; her mission to Beirut; and Brody's position as a Congressman.

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