Mark surprises the judge when he not only qualifies for, but becomes a winner on, The 1 Million Dollar Trivia Master, a television game show. Unbeknownst to Mark, veteran game show producers Harry Baxter and Art Healy, envisioning big ratings, decide to help the ex-race car driver along once they discover that the audience is cheering for him to succeed. To guarantee a winning streak, the producers have Hardcastle's estate bugged and begin basing their questions on Mark's home practice sessions. Although Hardcastle quickly realizes that something is amiss, Mark is unwilling to accept that the game is rigged. After Diane Templeton, one of the trivia show's employees, dies under mysterious circumstances, Mark turns around and admits that something is seriously wrong. Searching the show's offices, Hardcastle finds out why Diane was killed: She had obtained a tape proving the show is fixed. Meanwhile, Baxter and Healy discover that Bryce Benson, the shows host, had taken their plan to a deadly conclusion by killing Diane. Not wanting to face murder charges, the producers decide to tell Hardcastle everything. During the taping of the show's final round, Mark, giving up his chance to be a big winner, reluctantly helps the police stop Benson. Hinting at the series eventual conclusion, Mark jokes about going to law school in this episode.

Not wanting to continue cleaning up the estate, Mark hires Millie Denton, his former prison cellmate's widow, as a maid. Meanwhile, Hardcastle begins looking into the suspicious death of a lawyer named Charlie Clarkson. Taking over Charlie's practice, Hardcastle interviews Loni Summers, a model that had previously hired Charlie to handle her divorce. Discovering the divorce is now off, Hardcastle checks into the background of actor Dex Falcon, Loni's husband. Investigating, the judge discovers that Falcon had secretly been receiving millions of dollars from an attorney named Wendell Price. In the meantime, Millie, who claims to be a psychic, has a vision of Mark's murder. Ignoring Millie's warning, Mark proceeds with the case. To Mark's regret, he is captured by Price, shot and left for dead. Thanks to Millie, Hardcastle locates Mark in time to save his life. Next, based on the evidence Mark had gathered, Hardcastle and the police, having already taken Falcon into custody, movie in and arrest Price. As the episode ends, Millie, shaken up by her visions, decides to quit and move in with her sister.

As the final episode begins, Mark, who has secretly begun attending law school, is offered a paralegal job by Kenneth Malcolm, one of his professors. Meanwhile, Hardcastle, realizing that Mark's parole is up, decides to buy a car repair business, as a surprise gift for his friend. Upon hearing about Mark's job offer, Hardcastle, not wanting to stand in his friend's way, lies and tells his friend that he bought the company for himself. For his first assignment at law firm Malcolm, Hughes and Dewitt, Mark is asked to reclaim the possessions of Elsey, a resident of the Sunset Acres Retirement Home. Arriving at the home, Mark makes the acquaintance of Mimi LeGrand, a retired actress. Immediately liking Mimi, Mark is more than willing to comply when the former actress asks him to open a bank account for her. To Mark's surprise, he discovers that someone has already opened an account in Mimi's name. Concerned, Mark decides to go to Hardcastle for help. Before the two men are able to really learn anything in the case, they end up in jail as a result of a mistake made by Leroy, Hardcastle's assistant at the car company. While awaiting their release, Hardcastle decides to tell his friend the truth about why he bought the company. In response, Mark reveals that he has been going to law school in an attempt to follow in his friend's footsteps. Once released, Hardcastle and McCormick discover evidence that Malcolm and resident home manager Leonard Porter have been killing the residents and stealing their money. (They were able to move the money by secretly creating bank accounts in the seniors' names.) Armed with sufficient evidence, the crime fighting duo stop Malcolm and Porter. Despite the fall of his professor, Mark vows to continue attending law school. After selling the car business, Hardcastle makes a generous bet with Mark: If the ex-race car driver can beat him in a game of basketball, the judge will pay the law school bill. Due in the most part to Hardcastle's generosity, Mark wins the game.