When Scott Carter, a savvy civil and structural engineer, finds himself in an elevator at the top of one of his own high-rise building designs, a powerful blast in the basement rocks Carter from his everyday life into a media limelight - and ultimately into the crosshairs of a technically cunning terrorist, alias Jackhammer. Scott Carter and FBI Agent Michelle Taylor soon find themselves matching wits with an elusive mastermind targeting the lifelines of a city's public works.