The Breacher by Jordan Creed

Screecher-infested wilderness beyond the Walls – oppression within. Only the Breachers survive in both worlds. To save his brother from the monthly Discard, Nathan must become one. Keeping himself and his brother alive, however, isn’t all Nathan has to worry about. The Council is plotting something – something that could end his world as he knows it. But could the key to saving the entire Colony be hidden in his own past?