Rick Zahn

Reese infiltrates a gang to get closer to a former Marine that the machine tagged.

The gang discovers they may lose part of their bar due to a zoning mishap and an overzealous new business neighbor, and use unorthodox measures to remedy the situation.  Meanwhile, Dennis and Dee's mother, Barbara, returns to town and makes Frank's life miserable, and Frank takes steps to cement his roots in South Philly when he becomes part owner of Paddy's.

With Charlie under his wing, Frank cleans up so he can get his hands dirty and help out his old company with one last big merger. While an unwritten rule of the bar gets the rest of the gang caught up in a case of mistaken identity.

Gormley tries to locate a former NYPD detective he believes may be a threat to Frank's safety; Erin navigates office politics when she chooses to reopen a closed case; Jamie is transferred to a new precinct with a lot of problems.