The Lost Brotherhood - Harrison Hickman

Twenty-four Brotherhoods once kept the world safe from harm. All but one fell to dust. Disgraced soldier Benedict Nettlefold serves the last surviving Brotherhood, the Epsilons, who keep order through fear. When the Omega Brotherhood, once thought long gone, suddenly resurfaces, Benedict is dispatched on a mission to a remote Pacific island to put them down. Also on the mission is the man who destroyed his career and left his life in ruins. Arriving on the island, he finds something that could wipe out the Epsilon Brotherhood. But whose side will he take?