In the shadowed streets of a world unmarked by American heroism in World War II, Nazi banners drape the old brick and ivy of Cambridge, Massachusetts. The year is 1994, and the jackboot tread of the Reich echoes across the globe, now poised to crush the last bastion of freedom: a United States that never fired a shot in the great war.

Amidst the darkened spires of academia, two sisters—Charlotte Wahl, a painter lost in the canvas of her own making, and Zelda, a fiery spirit ensnared by the burgeoning resistance—stand at a crossroads of history and heartache. Each caught in the web of Nazi intrigue, they find themselves drawn to the very men who represent the iron fist of oppression: Charlotte to Klaus Dassel, a haunting SS officer, and Zelda to the enigmatic and fearsome August Voight.

As Zelda's resistance comrades fall under Voight's calculated gaze, a twisted game of espionage and betrayal unfolds, with Zelda herself branded a traitor. Meanwhile, Charlotte's brush is set aside for a waltz with the devil, as her heart betrays her to forbidden love. Each step closer to the enemy is a step away from who they once were, a descent into a moral abyss from which there may be no return.