When Boston is hit by a coordinated string of terrorist attacks, robotics innovator Louis Massina leads a team of tech geniuses to deploy every bot, drone, and cyberweapon at their disposal to save the city and bring the plot's mastermind to justice.

Carolyn Mackenzie is driven to solve the mystery of her older brother's disappearance ten years ago, hoping that she and her mother will achieve closure. Her pursuit of truth plunges her into a world of danger and unanswered questions. Do the police believe that Mack is a serial killer? Was Mack guilty of the murder of his drama teacher and the theft of his taped sessions with her?

Sheridan seeks an escaped prisoner, who happens to be a female serial killer.