In June 1966, new mother and wife Trish Weir is taken aback by the Supreme Court's decision to enact the Miranda Ruling. This ruling states that any evidence obtained from a criminal suspect without first delivering what is known as the "Miranda warning" is to be considered inadmissible in court, a situation that poses a significant threat to her quest for justice.
Flashing back three years prior, we meet a young and shy Trish, who at the time is an 18-year-old with dreams of her future, riding in the car with her mother, Zeola. On their way to work at a cinema, the projectionist, Jimmy, suggests they catch the late bus home together, and they make plans to meet before her shift on Saturday.
However, tragedy strikes later that night when a shaken and distraught Trish returns home after a horrific incident. Ann, her initially stern older sister, senses something is amiss and rushes her to the doctor at 4 a.m. to seek evidence of rape. When they return, Trish goes to bed while Ann breaks the news to their parents, Zeola and Paul. Instead of showing understanding, Zeola expresses sorrow over losing Trish's innocence, fearing it might hinder her daughter’s opportunities for a future career in secretarial school. She expresses doubts that the police will take her seriously.
The following morning, instead of offering genuine support, Zeola suggests that Trish consider “solutions” to the incident, including coercing the perpetrator into marriage or avoiding police involvement altogether. Disturbed by her mother’s callous attitude, Trish insists she must act to prevent this man from hurting others, but Zeola continues to express her belief that justice will not be served and that Trish will be labeled as "damaged goods."
The day after the incident, tensions rise at the police station. Trish is determined to file charges, while Zeola tries to persuade her otherwise, creating a split in family loyalties. Despite her mother's interjections, Trish recounts the harrowing details of what happened: after boarding the bus at midnight, she was forcibly taken by her assailant, who bound her hands and drove her into the desert, where he raped her at knifepoint.
After a week, Trish returns to her job, only to find Jimmy avoiding her, likely due to the ongoing police investigation. Meanwhile, Paul notes a suspicious sedan near the bus stop and manages to write down the license plate number. This leads detectives to Twila Hoffman, who has connections to the suspect, Ernesto Miranda. Upon investigating Twila’s home, they find evidence that ties Ernesto to the crime, after which he agrees to cooperate with the police.
At a lineup, both Trish and another victim, Barbara, identify Ernesto as their attacker, confirming his involvement in the assault. Trish specifically requests he wear glasses and speaks, which aids her identification and helps the police secure a confession.
During the 1963 trial, Trish stands firm and identifies Ernesto as the man who raped her. The defense attempts to create doubt about her testimony, but the jury ultimately finds him guilty. Amid these developments, Trish marries Charles and welcomes a new baby, while Ernesto’s conviction faces scrutiny that prompts an appeal to the Arizona Supreme Court. A lawyer from the ACLU, John Flynn, champions the retrial that is granted in 1967.
As the retrial approaches, Twila, who has distanced herself from Ernesto, steps forward to testify against him. However, Trish is hesitant to take the stand again, caught in a controlling marriage with Charles, who becomes aggressive when he learns about the prosecutor's visit concerning the case.
Charles ultimately faces the consequences of his reckless behavior and is pulled over for driving while intoxicated. Here, the prosecutor, Lawrence Turoff, emphasizes to him that Trish is one of the few courageous victims willing to press charges, further complicating their already tumultuous relationship. At the trial, Judge Wren stresses the importance of confidentiality regarding Trish's identity.
Twila’s testimony becomes pivotal for the prosecution as it is deemed admissible. During her time on the stand, she reveals that Ernesto confessed to her while they were together in jail. When Trish returns to testify, she openly shares her traumatic experience, confirming the act of rape while stating she had feared for her life.
In the end, Judge Wren and the jury unanimously find Ernesto guilty. After serving eight years in prison, he attempts to profit from his notoriety by selling autographed copies of the Miranda Warning. His story takes a fatal turn after a night of poker, where he meets his demise.
