Oldest son Danny (Donnie Wahlberg) is a detective who is
Oldest son Danny (Donnie Wahlberg) is a detective who is suspended when he shoots an off-duty officer, and later must face off against his sister, Assistant D.A. Erin (Bridget Moynahan), during a trial. Frank's youngest son Jamie's (Will Estes) first case involves the Cavazerre crime family. And Frank faces a crisis of conscience when Erin reopens the case of a convicted rapist he arrested 18 years earlier, and uses DNA evidence to prove that he was innocent.