Christian Wolff, only the latest alias he has used over the course of his life, owns and operates his own small accounting firm in Plainfield, Illinois. He is a high level autistic, who is able to control his need for strict order, routine, and the completion of tasks, and his natural inability to tolerate extreme external stimuli, through medication and a daily regimen designed to withstand such. His father, an Army colonel, made him and his younger brother, one of the few people to who he has always had a natural affinity, go through extreme physical and mental training, such as in the martial arts, when they were children so that they could defend themselves against any bullying specifically against Chris. Chris is also a savant when it comes to numbers, mathematics and spotting discrepancies in order. While Chris does have some legitimate accounting clients in Plainfield, his storefront is largely just a cover for how he makes most of his wealth - which is vast - as a forensic accounting consultant, usually to criminal organizations who are looking for any internal discrepancies i.e. if anyone on the inside is skimming off the top. On the advice of his unseen female associate, with who he communicates solely via electronic means, Chris takes a legitimate consulting job with Living Robotics, founded and still owned and run by Lamar Blackburn and his sister Rita, when one of their low level accountants, Dana Cummings, notices what she believes are some discrepancies in the company's financials over the course of years. Unknown to Chris when he accepts this job, his taking it, places his and Dana's lives in jeopardy, she another of those few people in life to whom he has a natural affinity, which may not be obvious on the surface due to his difficulty in social interaction. Upon learning that his and Dana's lives are at risk, Chris decides his self-appointed mission, against his regimen and routine, is to protect Dana at all cost, and figuratively - or literally if the opportunity arises - to put a bullet through the head of whoever has contracted the hit on them. Added to the complication of the situation is that Ray King, the highly successful director of the Financial Crimes Enforcement Network (FinCEN) at the Treasury Department, has assigned his most talented analyst Marybeth Medina to track down the man coined The Accountant who is known to work for crime organizations, the only real lead being The Accountant's photographs - none with a clear face shot - with known crime bosses, and another former alias used, Louis Carroll. King is clear that Medina's career is on the line if she is unsuccessful. While this assignment is outwardly working toward the goals of FinCEN, King has ulterior motives for wanting Medina specifically to track down The Accountant which he does not tell her.