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. Andrew Mayne is the Amazon Charts and Wall Street Journal bestselling author of The Girl Beneath the Sea , Black Coral , Sea Storm , Sea Castle , and Dark Dive in his Underwater Investigation Unit series; The Final Equinox and Mastermind in the Theo Cray and Jessica Blackwood series; The Naturalist , Looking Glass , Murder Theory , and Dark Pattern in the Theo Cray series; Angel Killer , Name of the Devil , and the Edgar Award–nominated Black Fall in his Jessica Blackwood series; and Impostor Syndrome and Mr. Whisper in the Specialists series. He was the star of A&E’s Don’t Trust Andrew Mayne and swam with great white sharks using an underwater stealth suit he designed for the Shark Week special Andrew Mayne: Ghost Diver . He worked on creative applications for artificial intelligence and served as the science communicator for OpenAI, the creators of ChatGPT, and is the cofounder of Interdimensional.ai. For more information, visit www.andrewmayne.com.