I'm working on this story where I have about 10-12 different characters in about 7 seemingly unrelated storylines, and it goes back and forth between the different stories. It's basically about how they all find out the world will end in a month, and what they do in their last 30 days of existence. By the end, all their stories sort of come together and their stories are all intertwined. It's all about how everyone's final moments really define them as people, and how even seemingly completely unrelated people can come together in desperate times. I was wondering, has anybody ever done anything like this? What have you done / what can be done to keep a story like this not too confused and "thrown together" ?