They were born together and they will die together.
One strong Alpha twin and one mutated Omega; the only thing they share is the moment of their death.
The Omegas live in segregation, cast out by their families as soon as their mutation becomes clear. Forced to live apart, they are ruthlessly oppressed by their Alpha counterparts.
The Alphas are the elite. Once their weaker twin has been cast aside, they're free to live in privilege and safety, their Omega twin far from their thoughts.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. The power to change the world lies in both their hands. One will have to defeat the other to see their vision of the future come to pass, but if they're not careful both will die in the struggle for power.