Five things to know:

Episode 1 (Oct 2016) saw Frank’s detective son Danny Reagan (Donnie Wahlberg) investigated for murdering a serial killer in season 6 (2015).

Also in episode 1, a police widow begged Frank to talk her son out of joining the police force and he struggled with his own demons about the job.

In episode 3 (also Oct 2016), Frank put department funding on the line when a benefactor was seen driving a fake cop car and jumping robots.

Assistant DA Erin Reagan (Bridget Moynahan) angered her brother Danny by getting involved in his murder case in episode 7 (Nov 2016).

And in episode 8 (Nov 2016), officers Jamie Reagan and Eddie Janko ( Will Estes and Vanessa Ray) started dating.