Danny and Jamie join forces with their nephew, Joe Hill, whenJamie and Joe's search for an undocumented teenage girl who hasbeen sex-trafficked, converges with Danny and Baez'sinvestigation into the murder of a woman in witness protection.Also, Frank and Erin butt heads when Frank calls out theDistrict Attorney's office for instituting a new rule thatclassifies armed robbery as a misdemeanor, a mandate that hasimmediate ramifications for Eddie and her partner.