What started out as a joke landed 17-year-old Dillon Yates in a lockdown juvenile facility in Boston Harbor. When he set up a prank Twitter account for his vice principal, he never dreamed he could be brought up on criminal charges. Judge Joe Scali gives speeches about getting tough on today’s wild youth. But Dillon’s mother, who knows other Blackburn kids who are doing hard time for minor infractions, isn’t buying Scali’s line. She hires Spenser to find the truth behind the draconian sentencing.