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Based on "The Age of Grief" by Jane Smiley, it centers on a dentist that has a dream that blurs the lines between fantasy and reality. Dr. Dave Hurst (Campbell Scott) shares two homes, three children and a private practice with his dentist wife Dana (Hope Davis). One evening, backstage at Dana's drama club production, Dave believes he witnesses his wife in an intimate exchange with another man. Emotionally repressed by nature, Dave's jealousy flares up in the form of a raucous alter-ego personified by an unsatisfied patient named Slater (Denis Leary). Slater goads the quiet dentist toward violent action, but the unraveling of the emotional bonds in the marriage is more than a simple threat of aggression can solve.