First Look: Frank Reagan's Past Becomes An Open Book

Tom Selleck as Frank Reagan

1. Tom Selleck as Frank Reagan

When Frank's first partner announces plans to publish a book filled with stories of their early days on the force, Frank worries about his personal stories being made public. Also, when Jamie and Eddie catch a call about a nearby officer needing assistance, the choices they each make will affect their destinies within the department and their relationship on "Back in the Day" (Season 6, Episode 12).
Tom Selleck as Frank Reagan and Len Cariou as Henry Reagan

2. Tom Selleck as Frank Reagan and Len Cariou as Henry Reagan

​"Back in the Day" (Season 6, Episode 12)
Will Estes as Jamie Reagan, Tom Selleck as Frank Reagan, and Donnie Wahlberg as Danny Reagan

3. Will Estes as Jamie Reagan, Tom Selleck as Frank Reagan, and Donnie Wahlberg as Danny Reagan

​"Back in the Day" (Season 6, Episode 12)
Donnie Wahlberg as Danny Reagan

4. Donnie Wahlberg as Danny Reagan

​"Back in the Day" (Season 6, Episode 12)
Will Estes as Jamie Reagan

5. Will Estes as Jamie Reagan

​"Back in the Day" (Season 6, Episode 12)
Tom Selleck as Frank Reagan

6. Tom Selleck as Frank Reagan

​"Back in the Day" (Season 6, Episode 12)
Bridget Moynahan as Erin Reagan and Steve Schirripa as Anthony Abetemarco

7. Bridget Moynahan as Erin Reagan and Steve Schirripa as Anthony Abetemarco

​"Back in the Day" (Season 6, Episode 12)
Bridget Moynahan as Erin Reagan

8. Bridget Moynahan as Erin Reagan

​"Back in the Day" (Season 6, Episode 12)