The unexpected passing 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 make their first appearance in court, their class action is threatened when they walk into traps set for them by the Blackwoods.

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.

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