Johnny Sack seeks permission from the prison to be released long enough to attend his daughter's wedding. Meanwhile, Tony thinks it it time to be on the lookout for some personal protection.
Tony leverages Johnny's misfortune into a domestic upgrade for Janice; a street gang attacks Bobby Bacala.
The family questions Erin's tactics when she tries to take down a gang leader by using his law-abiding brother as bait.
Lt. Van Buren discovers that someone may have tampered with evidence she used to convict a man 12 years earlier.
As Sherlock investigates an explosion that killed two people, he uncovers a crime that has been dormant for years; Watson wants Sherlock to choose a sponsor.