When a New York City construction crane mysteriously collapses, causing mass destruction and injury, forensic criminalist Lincoln Rhyme and detective Amelia Sachs are on the case. A political group claims responsibility for the sabotage and threatens another attack in 24 hours, unless its demands are met. Then a clue reveals to Rhyme that his nemesis, known as the Watchmaker, has come to town to fulfill his promise of murdering the criminalist. Now Rhyme and Sachs have to dodge his brilliant scheme to destroy them both, while racing against time to stop the construction site terrorists. With New York in a panic, Rhyme and his team must unravel a handful of plots as tightly wound as a timepiece --- before more cranes fall, raining down death and destruction from above.