Rachel receives a letter that creates an unexpected issue for Harvey and Louis. Mike's mentorship of Oliver and Marissa gets put to the test. And Donna gets a surprise from the IT department.

Harvey and Mike walk a fine line when they partner on a class action. Louis needs Rachel's help impressing a client during an annual presentation. Donna and Benjamin refine their product.

When Mike's class action hits a snag, it might cost him more than the case; Harvey, Louis and Rachel consider getting their hands dirty; and Donna and Benjamin seek an investor.

Mike needs Harvey and Rachel's help to overcome an impossible obstacle, or his dream of becoming a real lawyer is over. Donna's new venture hits a snag. Louis tries to patch things up with Tara.

Harvey and Louis fight to protect the future of the firm from its past; Alex worries Mike's instincts could risk a client relationship; Donna and Harvey delve into the aftermath of their kiss.