Diana Granger is a narcissistic young woman with a sense of entitlement. She believes the source of all her problems are her wealthy Aunt Margaret Granger, her guardian since her parents' deaths when she was a teenager, and more so her psychiatrist, Dr. David Haggis, whose assessment of Diana, under Aunt Margaret's directive, dictates what Diana can and cannot do. Diana has been institutionalized for long periods of her life and believes Dr. Haggis will once again have her committed in diagnosing her as bipolar. Jerry Marshall is a professional golfer coined by the sports media as "Second-Place Marshall" in not seemingly being able to finish in the stretch, and seemingly always beaten by Mike Wilson. Jerry's second-place finishes are not only emotionally devastating in Mike's easygoing big talk versus Jerry's more intense nature, but since Jerry has no one to share that pain with since separating from his wife Lee; they love each other but Lee doesn't really want to be a golf wife and Jerry is always on tour; also, Jerry cheated in the past, in a moment of weakness in his loneliness on the tour. Diana pursues Jerry at the latest tour stop, their meeting not just in her sexual interest in him. In what ends up being their pillow talk in Jerry succumbing to her advances following an argument with Lee, Diana casually suggests that each kills someone problematic in the other's life; such murders cannot be traced back to them. What Jerry assumes is just "talk" ends up being his worst nightmare not only when Mike is subsequently found murdered, but that sociopathic Diana, who killed him, has manufactured evidence both to kibosh Jerry's marriage to Lee, with whom he wants to reconcile, and point to Jerry as the murderer if he doesn't fulfill his part of the bargain and kill Dr. Haggis. Jerry must figure out how to get out of this, but doesn't know how far Diana will go to reach her end goal.
—Huggo