Set in the tense and uncertain years before World War II, Fear Itself follows Jimmy Nessheim, a young Special Agent in the fledgling FBI, as he goes undercover to infiltrate a new German-American organization known as the Bund.

Ardently pro-Nazi, the Bund is conspiring to sabotage American efforts against Adolf Hitler. But it becomes increasingly clear that something far more sinister is at work, something that seems to lead directly to the White House. As Nessheim moves closer to the truth, an even more lethal plot emerges, one that could rewrite history.