A blackout, a derailment, a flood--when disasters align with a mysterious countdown, Theo Cray, Jessica Blackwood, Brad Trasker, and Sloan McPherson hunt the engineer who scripts chaos.

A train derails in Idaho, nearly causing a nuclear disaster. An inferno at a battery facility in Florida disrupts the electrical grid for days. A potentially devastating failure is discovered at Virginia's Mud River Dam. To computational biologist Theo Cray, these aren't mere infrastructure accidents. They are virtually undetectable acts of sabotage.

Theo sees a mathematical pattern to the madness that few others can comprehend--except for his associates: rogue FBI agent Jessica Blackwood, private security specialist Brad Trasker, and Florida underwater investigator Sloan McPherson. If Theo's intuition and calculations are correct, the disasters are just a warm-up. The worst is yet to come--a catastrophe that could trigger the deaths of millions across the country.

Now Theo and his team are on the hunt for a mysterious saboteur whose only motive is to spread panic and chaos. And with every tick of the clock, his unthinkable endgame is getting closer to becoming a terrifying reality.