April 15, 2013: As always on Patriots Day, the Boston Marathon takes place. As it does every year, the sporting event is a huge public celebration that takes a horrific turn in the early afternoon. Within a matter of seconds, two explosive devices detonate in the race's finish area. Several people are killed and many others are injured. But Police Sergeants Tommy Saunders and Jeffrey Pugliese have no time to be in shock. Like Special Agent Richard DesLauriers, Police Commissioner Ed Davis, and nurse Carol Saunders, they are faced with a multitude of tasks: First and foremost, the injured must be treated, and there is also a race against the clock: The attackers must be tracked down and stopped before they can strike again...
Based on the report by Boston Police Commissioner Ed Davis, who led the investigation into the perpetrators and coordinated the various operations following the attacks at the Boston Marathon.