Zero Degrees Fahrenheit

In a world full of mutants and the decreasing amount of humans the world goes into all out war. Everywhere you go, snow, ice, blizzards. The only civilizations left in the world are tiny camps that are purely human. And caves that are purely demon. A few half mutant half human crossbreeds are among them. They look human, and are part demon. As are their thoughts. They need to keep the demon in check, or they loose control. A few hundred years of ice covering the globe, and mutant attacks on humans have passed. Now somethings up. Nobody can trust anybody. The only people with a clue are the crossbreeds, Will they save the earth that is left? Or will the mutants destroy it before the humans know what hit them? Even we don't know. Grab a blanket and be prepared for Zero Degrees Ferinheit.