After the notorious outlaws Amaranthe and Sicarius helped overthrow the corrupt faction controlling the empire and brought in a great war hero to lead the nation to prosperity, they finally earned their pardons—and some time off. A tropical vacation cruising around in a private submarine? Perfect. But their trip is interrupted by a summons from the new president: they're needed back at home. Trouble unlike anything they've ever dealt with threatens to destroy the capital city and throw the fledgling republic into chaos.

Republic takes place a few months after the events of Forged in Blood I & II.