In Season 8 opener, Danny contemplates retirement until Erin enlists him to help her with a case involving her ex-husband. Meanwhile, Jamie and Eddie go undercover as a couple; and Frank butts heads with the new mayor of New York City.

• Blue Bloods - Season 8
• Donnie Wahlberg
• Bridget Moynahan
• Tom Selleck
• Mitchell Burgess
• Robin Green