AruBerus
The battle for Shiganshina was won and the Survey Corps secured custody of the Colossal Titan. Three books taught Paradis all they needed to know about the hatred the outside world harboured for their island, and no one believed that they'd overcome fearful adversity and achieve peace with Marley's war machine by talking to the one enemy who could answer them but refused. No one but a single scout who'd believed in negotiation since the very beginning.
Canon divergent rewrite of Attack on Titan where Bertholdt survives Shiganshina and Armin seeks his cooperation with Paradis in search of peace between their home nations.