Frank faces a dilemma when a Marine veteran, who became a local celebrity for saving a woman's life, asks him to make an exception to the NYPD recruitment age limit so he can join the force. Also, an encounter with an old law school rival leads Erin to look into an alleged wrongful conviction; Jamie is torn over whether to report a sergeant close to Eddie for punching a fellow officer; and Danny and Baez race to find an abducted child.