Jonas Amsel and Avalina Keller, devoted Nazis and best friends, have a bright future in Hitler's Third Reich. Ava, a talented gymnast, wants to serve Germany in the Olympics, and Jonas, who has loved Ava since they were children, wants nothing more than to marry her and start a family. When he is about to propose, however, Ava and her entire family vanish without a trace.

Jonas blames the Jews for Ava's disappearance and throws himself into a career in the Nazi Party. He serves the Reich under the ruthless Chief of the Gestapo, Reinhard Heydrich. Jonas becomes particularly good at capturing members of the Black Foxes, an anti-Nazi resistance group, earning Heydrich's respect and the moniker of "the Fox Hunter."

Impressed by Jonas' skills, Heydrich gives him his most difficult task yet: capture the elusive Black Fox One, the Black Foxes' most deadly and mysterious operative. No Nazi who has pursued Black Fox One has returned alive, but Jonas is determined and confident. Capturing Black Fox One might bring him one step closer to finding Ava.

But while he is hunting Black Fox One, Jonas makes a shocking discovery, forcing him to make an agonizing decision. He must choose between his love for the Reich and his heart, torn between the lies he has been taught all his life and the new truth before him.

Black Fox One is a thrilling World War II story of lost love, bravery, and the hard road to redemption.