In the aftermath of an unspeakable act of terror, Police Sergeant Tommy Saunders joins courageous survivors, first responders and investigators in a race against the clock to hunt down the Boston Marathon bombers before they strike again.

Mark Wahlbergas Sgt. Tommy Saunders
John Goodmanas Commisioner Ed Davis
J.K. Simmonsas Sgt. Jeffrey Pugliese
Kevin Baconas Richard DesLauriers
Michelle Monaghanas Carol Saunders
Alex Wolffas Dzhokhar Tsarnaev
Themo Melikidzeas Tamerlan Tsarnaev
Michael Beachas Gov. Deval Patrick
Vincent Curatolaas Mayor Thomas Menino
James Colbyas Superintendent Billy Evans
Tobias A. Schliessler