"The Art of War"
In the conclusion to the season's two-part finale, a member of the Reagan family is shot and Danny must track down the gang member responsible, without letting his emotions cloud his judgement. He also has to be creative to bring in witnesses.
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