Rhigosis [The 100 AU]

What if they got it wrong? What if the earth wasn't pretty much totally unaltered after an apocalyptic war? What if instead, it was plunged into a nuclear winter?
It's been 97 years and the Ark hasn't seen more than glimpses of the surface of the earth for years. The thick ash-clouds overlay the entire planet, blocking sunlight and warmth from reaching the surface of the earth. Nothing could survive down here, right?
When sickness begins to spread, only the boy who'd suffered from the flu in the past can help. Clarke and Bellamy are forced to accept Murphy's help, but how long will this last? Will Murphy manage to keep the uneasy peace, or will it be shattered by murder?
[This AU will NOT follow the main plot line, for obvious reasons. There will be some similar scenes, but mostly it will be totally new. That said, I WILL be taking liberties with designing new flora and fauna, and civilizations. They will for the most part, however, be parallels. Also, the story is technically Murphy-centric, with minor Murphy/OC angst, but will also follow Clarke and Bellamy. Character deaths will follow the same as the show, up to however far I've watched. This means characters who die in the show WILL be killed off in this AU, as soon as I get around to it.]
[I need to preen a little about my cover, because I love it so much. It took me about three hours in gimp, and that's just because I haven't used gimp in ages. But if you would like me to design a cover for you along the lines of this one, I'd be glad to. Just message me.]
[Styx - http://www.polyvore.com/cgi/set?id=145790130