While the city of Boston is shocked by multiple explosions, police sergeant Tommy Saunders joins the field investigators in a race against the clock to track down and arrest the perpetrators before they strike again. Combining the paths of Special Agent Richard Deslauriers, Commissioner Ed Davis, Sergeant Jeffrey Pugliese and Nurse Carol Saunders, this uncompromising narrative evokes the most complex manhunt ever conducted by the US police – and gives a vibrant homage to the heroes of everyday life.