The unexpected death of an old friend takes Billy McBride to California’s Central Valley, where a record drought has made water more valuable than human life.

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.

As Billy and Patty close in on the Blackwoods, Wade tries to cover up their crimes while Diana makes one final, desperate play, regardless who gets in her way.

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.

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