Blue Bloods: Season 12, Episode 6

12 - 6: Be Smart or Be Dead

Frank causes family tension when he assigns Jamie to guard Danny after a hit is put on him, and when Frank tries to stop his cop grandson, Joe Hill (Will Hochman), from seeking revenge after he's attacked. Also, Eddie gets a hostile new partner, and Erin's moral character is attacked by the defense when she tries an old murder case related to her boss, the D.A.