Blue Bloods season 9 episode 15
Episode title: Blues
While off duty, Danny witnesses a gas station robbery in progress and is forced to use his weapon, leaving him shaken and his family and co-workers concerned. Eddie apprehends a turnstile jumper who pleads for leniency by offering information on a missing weapon that's vital to one of Erin's cases. Frank learns that a top officer in his department has a dark past.
