Plot
Martin Vail is an arrogant Chicago defense attorney, known for his undesirable but high-profile clients, including mob boss Joey Piñero. Fond of the spotlight, Vail is profiled for a magazine cover story, and tries to rekindle a casual relationship with his former colleague, prosecutor Janet Venable.
Beloved Archbishop Rushman is savagely killed in his bedroom and his body mutilated. Aaron Stampler, a 19-year-old altar boy from Kentucky, is caught fleeing the scene covered in blood and charged with murder. Vail offers to defend him pro bono, and the meek, stuttering Aaron claims he is innocent but is prone to amnesia. Vail believes Aaron, while the state's attorney, John Shaughnessy, assigns Venable to prosecute the case and pursue the death penalty.
At Aaron's apartment, Vail's investigator Tommy Goodman is attacked by another altar boy, Alex, who flees. Neuropsychologist Dr. Molly Arrington interviews Aaron for hours about his difficult childhood, his memory lapses, and his missing girlfriend Linda. With help from Piñero, Vail discovers that powerful civic leaders, including Shaughnessy, lost millions in real estate investments due to Rushman's decision not to develop church-owned land. In court, a message carved into Rushman's chest is linked to a passage from The Scarlet Letter , denouncing the archbishop as "two-faced".
Vail and Goodman track down Alex, who was searching for an incriminating VHS cassette. Stealing the tape from the archbishop's closet, Vail and his team discover footage of one of many encounters filmed by the archbishop, in which he coerces the formerly homeless Aaron, Linda, and Alex to engage in sexual acts on threat of eviction from their group home. Vail angrily confronts Aaron about concealing information from him, but Aaron denies the accusations, becoming increasingly distressed as Vail continues to press him. Aaron's demeanor abruptly shifts from deferential to aggressive, and he chastises Vail for "scaring off" Aaron. This violent personality, Roy, admits to killing the archbishop but threatens Vail not to introduce the tape at trial. Suddenly, he reverts back to Aaron's docile personality, with no recollection of the episode.
Dr. Arrington concludes that Aaron has dissociative identity disorder caused by years of abuse at the hands of his father and, later, Rushman. Conflicted, Vail knows that he could acquit his client via an insanity defense, but legal rules would not allow him to change his strategy mid-trial. He delivers the evidence anonymously to Venable, forcing her to use the tape as proof of Aaron's motive, at the risk of tarnishing the archbishop and generating sympathy for Aaron. Shaughnessy commands her to destroy the evidence, but she refuses and introduces it in court.
Piñero is discovered murdered, and Vail surprises the court by calling Shaughnessy as a witness. Vail suggests Shaughnessy resented the archbishop for stopping the $60 million land development, and accuses him of concealing previous evidence of the archbishop's sexual predation, and for being complicit in Piñero's death. Judge Shoat intervenes, striking the line of questioning from the record and fining Vail for using the courtroom as a stage for his own vendettas.
Dr. Arrington's testimony that Aaron's "body could be present at a homicide and yet his mind would be unable to recall it" is dismissed by the judge as too close to an insanity plea. Vail calls Aaron to the stand, intentionally triggering his memories of his father's abuse. Venable begins a challenging cross-examination, in which Aaron suddenly becomes Roy, screaming obscenities and choking Venable before he is subdued. The judge dismisses the jury in favor of a bench trial to declare Aaron not guilty by reason of insanity.
A shaken Venable rejects Vail's advances, and Vail informs Aaron that he will be remanded to a psychiatric hospital for treatment with a strong possibility of release. Aaron profusely thanks Vail and asks him to apologize to Venable for the injuries to her neck, leading Vail to realize that Aaron was aware of his actions during the attack. Aaron commends the attorney for his insight, then brags about having murdered Linda and Rushman without remorse and faking having multiple personalities. In disbelief, Vail declares, "There never was a Roy," but the murderer corrects him: "There never was an Aaron, Counselor." Stunned and disillusioned, Vail leaves the courthouse, but does so through a discreet back entrance to avoid the attention and publicity he once sought.
