"Under the Gun"
Danny and Baez investigate the murders of three prominent community leaders, while Frank meets with a group determined to ensure these incidents are treated seriously. Elsewhere, Danny and Linda clash when she decides she wants to carry a gun in the wake of being mugged.
"Sins of the Father"
A case that has occupied the Reagan family for four years is on the verge of a conclusion as Frank pushes to find evidence against a suspected cop killer who shot one of Henry's fellow officers. Meanwhile, Danny and Baez investigate a string of murders involving adult-film stars.
Tom Selleck as Frank Reagan
Will Estes as Jamie Reagan
Donnie Wahlberg as Danny Reagan
Len Cariou as Henry Reagan
Jennifer Esposito as Jackie Curatola
Nicholas Turturro as Sgt. Anthony Renzulli
Amy Carlson as Linda Reagan
Sami Gayle as Nicky Reagan-Boyle