Marybeth Medina, deputy director of the Financial Crimes Enforcement Agency, learns of the death of her former supervisor Ray King. In an attempt to find the killers, she takes Ray's clue and contacts Christian Wolff, a brilliant autistic mathematician and shadow auditor with killer skills. Enlisting the support of his brother Braxton, Christian gradually puts all the pieces of the puzzle together, but King's killers aren't slumbering either.