Trial and Error

A school assignment gets uncomfortably personal for Joan when she's chosen to play the role of prosecutor in a mock trial based on the children's story "Jack and the Beanstalk." On the side of the defense is Grace, who's representing an ill-at-ease Adam in the part of Jack. In other events, Helen is troubled that Kevin is dating Lilly (Constance Zimmer); and an 8-year-old girl's murder appears to be an open-and-shut case for Will.