Berlin, February 1919. The Spartacists’ Revolt is over, the revolution failed, its leaders dead. The Freikorps rule the streets.

In the aftermath of the brutal murders of communist leaders Rosa Luxemburg and Karl Liebknecht, former intelligence officer Oberstleutnant Alaric von Trelow is tasked with uncovering the traitor who betrayed them to their deaths.

Drawn, against both their wills, back to Dr. Lise Freisinger—physician, revolutionary, and Rosa's devoted protégé—von Trelow must navigate Berlin's treacherous political underground. As the pressure builds in Berlin, von Trelow finds himself caught between duty and desire, his loyalties to class, army, and former comrades, and his growing feelings for a woman who embodies everything they despise.

But in a city where allies become enemies overnight and yesterday's patriots are today's hunted fugitives, the most dangerous betrayals come from those closest to the heart. As the forces of reaction and communist resistance explode into open warfare, von Trelow races against time to uncover a conspiracy that threatens to destroy not only his mission, but everyone he has come to love.

A gripping tale of political intrigue, forbidden romance, and the brutal cost of revolution, set against one of history's most violent and chaotic eras.

In Red Berlin, the last act of loyalty is betrayal.