Homeland doesn’t take the easy outs that most TV shows do.
Also, here’s a long, long, long interview where the co-creator walks through season 1. It’ll be four parts, I believe. As of now, two are out. There be spoilers.
http://www.avclub.com/features/the-walkthrough/
Sample quote-age:
AVC: You also keep quite a few secrets about Carrie. She’s much more clear to us than Brody, but at the same time, we don’t entirely know the nature of her mental illness. How did you decide what to keep mysterious about her?
AG: She was a work in progress as well. When the series was originally conceived, although we always wanted to take it to paid cable, we had some masters to serve first. So we did write the thing on spec. [In television terms, a pilot written on spec is a script written without a guaranteed sale. —ed.] It was always done on spec for 20th Century Fox television. So, we had to shop it around to the networks first, and especially we had to shop it around to Fox first.
We knew that if we did it for a network, there was no way we’d be able to have two ambiguous protagonists. There’s no way we’d be able to have an unreliable Carrie Mathison, and there’s very little chance that we would have been able to have a gray Nick Brody. So, in the first incarnation of this, Carrie was more or less a straight-ahead intelligence officer. It was only when Fox decided that a serialized show was not what they wanted to do, and we were able to take it to Showtime, that’s when we started to get a lot more interesting with the characters.