Dr. Kimberly Powell, a neuropsychologist, works on the roots of violence by calming the brains of aggressive rats. Her successes lead to trials in volunteers and prisoners, and then to patients.

Soon it becomes clear that Kim’s brain stimulating techniques, besides controlling aggression, offer the potential to cure a number of medical problems including Parkinson’s disease, depression, PTSD, and many others.

When the court instructs Kim to treat a psychopathic killer, she’s appalled. What would such a killer, if cured, still owe to his victims and to society? The ethical implications of the research and especially its application on humans are substantial, but so, too, is Kim’s altruistic desire to help.

Kim must decide how far and how fast these trials should proceed—and, at what cost?

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