Despite being reunited with her husband from prison, Emily Taylor becomes severely depressed with emotional episodes and suicide attempts. After conferring with her previous doctor, her psychiatrist, Jonathan Banks, eventually prescribes an experimental new medication called Ablixa, but the drug's side-effects lead to Emily killing her husband while in a "sleepwalking" state. With Emily plea-bargained into mental-hospital confinement and Dr. Banks' practice crumbling around him, the case seems closed. However, Dr. Banks cannot accept full responsibility and investigates to clear his name. What follows is a dark quest that threatens to tear apart what's left of his life even as he discovers the diabolical truth of this tragedy.