Denny's strong conservative values are put to the test when the firm represents a Democratic congressman who refused to keep a promise to his supporters. Alan tries to forget about Tara as he prepares to defend Catherine who is on trial for murder. Meanwhile, Sara is given a bizarre ultimatum.

At the courthouse, Alan runs into an old flame and coworker, who's looking very guilty in a bloody wedding gown; Claire reluctantly defends a cell-phone thief; and Denny's prejudices are driving a wedge between him and Bethany.

Denny needs Alan's help after using an employee's weight as a reason for dismissal; Clarence is upset by an Internet posting of him as Clarice; Katie and Whitney work on a murder case involving racism and the police; and Jerry is anxious about taking a relationship to the next level.

Alan fields a difficult request from Shirley after her father suffers an injury while in the late stages of his battle with Alzheimer's; Carl represents a group of Nantucket residents who are concerned about homeland security; Jerry's new girlfriend sues him for sexual assault.

Denny is arrested on concealed-weapon charges after shooting a man who tried to rob him and Jerry. Meanwhile, a case gets personal for Alan when he tries to help a sex surrogate in a custody battle for her daughter.