Mary must protect her least favorite witnesses on the day of her sister's wedding.

With Jinx out of town and Mark busy with a last minute business trip, Mary has no choice but to head to work with Norah in tow. But when Mary arrives, Delia points out the obvious: Mary can't be with Norah and a witness at the same time. Meanwhile, Marshall and Abigail are trying to determine whether or not Kristi Owens should enter WITSEC and Associate Director Campbell gives Stan some surprising news about the future of the Albuquerque office.