All 22 episodes from the ninth season of the US drama following a family of New York cops headed by Frank Reagan (Tom Selleck). As well as the head of the family, Frank is the New York City Police Commissioner, following in the footsteps of his father, Henry (Len Cariou). Frank's children also share his passion for law and order: Danny (Donnie Wahlberg) is an NYC detective, Erin (Bridget Moynahan) works in the District Attorney's office and Frank's youngest son Jamie (Will Estes) works undercover. In this season, Danny seeks revenge on drug cartel member Luis Delgado (Lou Diamond Phillips), Erin struggles with office politics when she receives a promotion at work, and a blackout in New York causes mass panic and chaos in the city. The episodes are: 'Playing With Fire', 'Meet the New Boss', 'Mind Games', 'Blackout', 'Thicker Than Water', 'Trust', 'By Hook Or By Crook', 'Stirring the Pot', 'Handcuffs', 'Authority Figures', 'Disrupted', 'Milestones', 'Ripple Effect', 'My Brother's Keeper', 'Blues', 'Past Tense', 'Two-Faced', 'Rectify', 'Common Enemies', 'Strange Bedfellows', 'Identity' and 'Something Blue'.