New York City, 1941: Charles Mossman has lost his job, his wife, and his future prospects after a short stint in prison for a bar fight gone awry. The only bright spots in his life are the afternoons he spends with his daughter after school, picking her up from the nanny who watches her and delivering her home before his wife gets home from her factory job in the evenings.

But one day he meets the elderly Swiss couple living next door to his wife, Mr. and Mrs. Bauer, and something seems...not right about them. Maybe it's the German they’re teaching his daughter, maybe it’s all of the strangers he sees going in and out of their apartment. Though they claim to be as distraught over Hitler’s actions in Europe as other Americans, Mossman isn’t sure he believes them, and soon, he’s convinced that there’s more to these people than meets the eye. And he’s determined to find out what’s really going on.

What he finds could not only endanger his daughter but also all of New York City. As the shadow of war creeps closer to the States, one man has the ability to bring down a nest of Nazi spies doing Hitler’s work in America. Based on the true story of the Duquense Spy Ring, Gross once again delivers a tense, stirring thriller set against the backdrop of a nation about to go to war.