With the threat of the Great War looming at America's doorstep, fear of immigrant disloyalty has become enough to divide the nation. So when German-born Amara Müller's brother decides to join the fight, he leaves her behind in St. Louis with one final directive: Stay safe. There's only one certain way to keep herself out of suspicion's spotlight, but will she have the courage to see it through?

Accustomed to a strict diet of cigars and spirits, Emil Kisch has become the master of a worry-free good time. And as one of St. Louis's best morality squad detectives, he's able to skirt the drinking laws as easily as he arrests others for breaking them. To him, war is a problem for other men. Until one night he makes a mistake that even a glass of whiskey can't wash away. Is it too late to reverse the course set in motion?

As their lives are intertwined with the fate of the war, Emil and Amara must fight to save what they both hold most dear. But which side of the line do you stand on when your allegiance belongs to both?