As U.S. Attorney Karen Shimizu tries to get rid of her troublesome agent once and for all, Jackie schemes his way into a new mission. At the Suffolk County Courthouse, Decourcy and Siobhan spar on opposing sides of a legal battle. Meeting dead-ends at every turn in the effort to help her son, Grace does something desperate. With a nudge from Maeve, Jenny surprises Benny with some rebellious fun. On the other side of town, Cathy re-ups her supply by going straight to the source.