Harvey takes on Professor Gerard as a client in a bribery investigation and discovers that he may have committed an ethics violation, and Louis makes a catastrophic mistake with his first client as name partner.
While Harvey helps Mike and Louis settle their differences on a road trip to see a client, Harvey flashes back six years to his initial rift with Louis, and Mike flashes back to his first encounter with the firm.
Harvey finds out that Donna may have broken the law to help Mike get a document in the whistleblower case, but he may not be able to save her. Meanwhile, Jessica tries to figure out her next step in her relationship with Jeff.
Mike and Rachel's engagement is put on the back burner as Donna leaves Harvey to work for Louis. Harvey is in denial and is confident she will return, but will he be able to handle it when he discovers she's not bluffing?
Mike teams up with his future father-in-law after Jessica says no to his case. Meanwhile, Harvey uses Charles Barkley to retaliate against Jack Soloff, but the fight and another confrontation with Donna triggers another anxiety attack.
Harvey confesses and apologizes to Louis for punching him, but will it be enough to keep him from getting revenge? Mike's promotion goes through, but the opponent in his first case as partner knows his secret.
Jack Soloff initiates Daniel Hardman's power play to get back in the firm and take away Harvey's clients. Louis tries to find the dirt Hardman has on Soloff. Rachel discovers that her mom's big wedding plans could reveal Mike's secret.
Hardman prepares his takeover of the firm, Jessica appears to be on her way out, and Harvey is nowhere to be found. Meanwhile, Mike turns to the church to come up with a solution for his dilemma with Rachel.