In the final season, 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.

As Billy faces repercussions from his conduct, he is forced into a truce with an old adversary.

Billy and Patty take measures to protect a witness, while the partners at Margolis & True scramble to strengthen their case.

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

In a final showdown with George Zax, Billy and Patty seek justice for the victims of the opioid epidemic, no holds barred.