When Billy learns the name of the real shooter, he has to turn to the FBI to help him bring his elusive suspect in for questioning.

On the night of the mayoral election, Billy and his team race to take down the people responsible before they become an unstoppable Goliath.

Billy’s investigation into the Central Valley’s water problem threatens the launch of Diana Blackwood’s almond-based lifestyle brand.

As Billy and Patty begin a class action lawsuit against the corporate farmers, the Blackwoods start dealing with everyone who gets in their way, including Billy.

Flashing back to before the events of the season, Billy has a drunken weekend at the Rising Sun Hotel and Casino, crossing paths with the Blackwoods and their scheme to steal water.

Billy and Patty grill the Blackwoods in their depositions, shining a light on their complicated relationship and how they obtained ownership of the county’s water supply.

Billy puts Wade Blackwood on the stand and under oath, forcing him to admit every detail of his scheme to steal the state’s water.

Billy returns to his Big Law roots after Patty takes a job at a prestigious white-shoe law firm in San Francisco. Together, they try to take down one of America’s most insidious Goliaths: the opioid industry.

Patty finds herself on the hook for Billy’s behavior as he digs deeper into the case.

As Billy and Sam grow closer, he discovers that the opioid industry is keeping bigger secrets than he ever imagined.

Billy goes to extremes to keep the case alive, and Sam questions whether bringing him on board was a good idea after all.

When Patty calls a surprise witness to the stand, the defense does everything they can to undermine the witness’s credibility.