Pearson Specter Litt has scored a hard-fought victory, but the fight has left the firm shaken. Although she avoided jail time, Donna has left Harvey, after more than a decade of working together. She is now working for his long-time rival Louis. And while Jessica readjusts to being single, Mike and Rachel are giddy after his marriage proposal.

Harvey searches for a replacement for Donna. Mike takes a case as a favor, which he must justify to Jessica - while Rachel's father, Robert Zane, offers some unsolicited advice about Rachel's engagement to Mike. And Louis is embroiled in surprising money matters, while an up-and-coming partner, Jack, makes his presence known to Jessica, confronting her about whether Harvey's way of doing business is beneficial to the firm.

Harvey brings some star power to his ongoing conflict with Jack Soloff - a conflict that Louis and Donna can't seem to stay clear of. Mike brings in Robert Zane to co-counsel a case, pitting his instincts as a lawyer against his desire to stay in his future father-in-law's good graces. And while Jessica mediates between Mike and Zane, she tasks Rachel with an unusual assignment.

Harvey steps outside his usual area of expertise, in order to take a case from a client who has a special tie to the firm. Mike and Zane work their class-action case together, but Mike learns they have different ideas about what constitutes a win - for themselves, and for their clients. And Donna counsels Louis on the best way to settle a feud.

When Harvey's bitter rival Travis Tanner turns up on the other side of a case, claiming to be a changed man, Harvey and Mike must decide whether to believe him - or bury him. As Harvey's sessions with Dr. Agard continue, she links his personal stake in the Tanner fight to issues from his past. Meanwhile, Jessica tasks Louis to make things right with Harvey, and with Rachel and Donna's help he devises a plan - one which could make an enemy of the formidable Jack Soloff.

Reeling from Dr. Agard's revelation about the root of his panic attacks, Harvey is forced to make a tough personal decision in a case that touches a nerve. Meanwhile, Mike and Louis have taken over responsibility for Harvey's oldest client, and must decide what to do when that client's demands go against his own best interests. And Donna tries to work her magic to make Rachel's dream wedding possibl.

At Jessica's behest, Mike teams up with Jack Soloff to co-counsel a case, and despite their history the two come to a surprising understanding. Meanwhile, Esther Litt returns to P.S.L. to solve a problem discreetly, but Louis rarely handles anything quietly - especially when it comes to family. And Donna and Harvey try to get their friendship back to normal, but Harvey has a hard time stomaching Donna's "friendly advice".

Jessica does damage control in the wake of Harvey punching Louis, just as Jack Soloff and Daniel Hardman are looking for weaknesses to exploit. Meanwhile, Donna counsels both men on how to rectify their issues. And Mike must find a way to turn down his recently announced promotion without raising suspicion - while he and Rachel combat an opposing attorney who holds the key to uncovering his secret.

Rachel and her mother, Laura Zane, plan for Rachel's dream wedding, but Rachel fears the event may reveal Mike's secret. Meanwhile Daniel Hardman and Jack Soloff make their move against Jessica and the partners, as Harvey and Mike tangle with Hardman's mysterious backer, and Louis tries to find Jack's Achilles heel.

Jessica and Louis attempt to rally the partners to prevent the takeover attempt by Hardman and Soloff. Mike and Harvey both have to deal with demons from the past as they make potentially life-altering decisions.

Mike's worst fears have come true. He's been arrested for fraud and is under investigation by a ruthless government prosecutor, Assistant US Attorney Anita Gibbs. Meanwhile, Jessica and Harvey must figure out how to build a defense for Mike, knowing full well that he's guilty of the crime for which he stands accused. And Rachel must come to terms with her family's reaction to the news that her fiancé is not the person he claimed to be - and that he could soon be in prison.

Mike and Louis must identify an anonymous tipster in order to diffuse a damning piece of evidence. Gibbs isn't just after Mike, she's set her sights on Jessica and Harvey as well.

With time running out before Mike's case goes to trial, Harvey and Mike are at odds over their strategy, and just what lengths they'll go to in order to defeat Gibbs.

Time is running out before the trial and Mike wants to represent himself. Harvey wants lead and challenges Mike to a showdown. Louis attempts to get Sheila out of the picture for good.

With things looking bad for the firm, Louis mulls over Anita Gibbs' offer to turn on his compatriots in exchange for immunity. Meanwhile, Rachel gives Mike advice on how best to win hearts and minds in the courtroom. As the pressure mounts, Donna pleads with Harvey to not do anything rash, even as Jessica encourages him to do so. And Harvey and Mike look to a new, last-ditch strategy to win the case ... but as they run out of moves to play and deals to make, they face the possibility of putting Mike's fate in the last place they want it - the hands of a jury.

As Mike's day of reckoning draws near, it threatens to shatter the lives of those closest to him. Faced with the uncertain outcome of his knockdown, drag-out court battle, Mike makes the one play he has left. Meanwhile, he and Rachel must make a huge decision about their future together. Louis battles an old friend to protect the firm from an outside threat, while Jessica fights to keep the firm intact from within. And Harvey and Donna come up with one last long shot move that could save Mike but at great cost to Pearson Specter Litt.