The map of bones

Four hundred years in the future, the Earth has turned primitive following a nuclear fire that has laid waste to civilization and nature. Though the radiation fallout has ended, for some unknowable reason every person is born with a twin. Of each pair, one is an Alpha - physically perfect in every way; and the other an Omega - burdened with deformity, small or large. With the Council ruling an apartheid-like society, Omegas are branded and ostracized while the Alphas have gathered the world's sparse resources for themselves. Though proclaiming their superiority, for all their effort, Alphas cannot escape one harsh fact: whenever one twin dies, so does the other.