The Omegas live in segregation, cast out as soon as their mutation becomes clear. Forced to live apart, they are oppressed by their Alpha counterparts. The Alphas are elite. Once their weaker twin has been cast aside, they're free to live in privileged safety. Cass and Zach are both perfect on the outside - no missing limbs, no visible Omega mutation. But Cass has a secret - one that Zach will stop at nothing to expose...