Los Angeles, 1931. On the heels of an unsavory investigation involving a famous comedian, Perry Mason – a PI struggling to make ends meet – and his right-hand man Pete Strickland are hired by attorney E.B. Jonathan, Perry's mentor, to solve a perplexing case: the brutal kidnapping of one-year-old Charlie Dodson, whose parents Matthew and Emily were targeted for a $100,000 ransom.

Following one of her trademark barn-burning sermons, Evangelical preacher Sister Alice offers the Dodsons the church's full moral and financial support – much to her mother Birdy's dismay. During a routine domestic intervention, beat cop Paul Drake is rerouted to a gruesome crime scene, where he follows a confounding trail of evidence.

In order to gain an advantage over E.B. and team, wily district attorney Maynard Barnes goes public with a shocking new development. Mason and Strickland get unauthorized access to physical evidence with help from Virgil, Mason's connect at the city morgue. Later, Mason attempts to extract information from a withholding Drake, who's weary of Holcomb and Ennis' watchful eyes.

Mason and Strickland lean on Virgil, again, for extra-legal assistance. Following Sister Alice's recovery from a frightening episode, Birdy urges her daughter to renounce her claims about baby Charlie. E.B. faces the reality of his financial situation and takes his frustrations out on Della.

While Mason and Della run a solemn errand up north, Strickland tracks down the sergeant originally assigned to the Dodson case. Before returning to L.A., Mason drops in on his ex-wife Linda and son Teddy, hoping to make amends for his recent shortcomings. Della sets out to find Mrs. Dodson more capable legal representation.

As Emily's trial begins and a damning witness testimony takes center stage, Mason attempts to recover from a shaky start. Meanwhile, in their search for clues that might lead to an exoneration, Della and Strickland investigate a potential connection between Detective Ennis and Charlie's kidnappers. Later, Mason considers betraying Drake's trust to give his client an edge.

Hoping to expose the hidden link between the Radiant Assembly's staggering debt and Charlie's ransom, Mason puts Herman Baggerly on the stand. Sister Alice faces mounting pressure from the church elders about her promises for a "resurrection." Strickland loses track of a key witness, while Drake's detective work opens a new avenue in the case.

After the team receives some unvarnished critique from Hamilton Burger, Della presents an increasingly stubborn Mason with her case for putting Emily on the stand. As the sensational trial winds to a close, Mason, Strickland, Della, and Drake attempt to tie up loose ends - and set the stage for their futures.

1933. In the months following the Dodson trial, an aimless Perry leans on Della to keep the law firm afloat. Paul accepts a job from an unlikely source. Corrupt oil scion Brooks McCutcheon recruits Detective Holcomb in his quest to reshape the future of Los Angeles.

After a manhunt pegs brothers Rafael and Mateo Gallardo for the McCutcheon murder, Perry initially resists taking the case… until a hunch reels him in. Della goes on a date with a new flame while Paul wrestles with a shocking truth.

As Rafael and Mateo face discrimination from their fellow inmates and the court, Perry continues his push for justice, while Della engages the help of wealthy socialite Camilla Nygaard. Paul chases leads in the Hooverville. Perry goes head-to-head with tycoon Lydell McCutcheon.

When Paul’s explosive discovery blows a massive hole in Rafael and Mateo’s story, Perry begins to question his clients’ innocence, while Della doubles-down on the case.

As the Gallardos’ trial nears, Perry attempts to negotiate with the DA. Rafael and Mateo recount the real-life consequences of the McCutcheons’ Los Angeles expansion. The pursuit of a lead lands Paul in danger. Perry makes a convincing demonstration in court.

After he’s subpoenaed, Holcomb offers Perry an olive branch. Meanwhile, Della continues to foster her relationships with Camilla and Anita, giving her the confidence to question her first witness – and push the verdict in the Gallardos’ favor.

Facing career-ending accusations and potential jailtime, Perry must turn to Strickland to stay ahead of the prosecution—and Lydell. With the Gallardos' fate in the balance, Della presses Hamilton for answers, while Paul enlists Clara to infiltrate a wealthy white suburb in pursuit of the truth.

As their final day in court nears, Mateo and Rafael prepare for the worst, while Perry, Della, and Paul work with an unlikely ally to sway the prosecution's hand. Then, after making his closing arguments, Perry faces the consequences of his relentless pursuit of justice.