A Black Day

Vin Cooper thought life had finally slowed down. A new post with the U.S. Marshals Service, a nine-to-five routine, a home in D.C. with Anna and their infant daughter Ava.Then a disgraced DARPA engineer is executed in a backwater Georgia town, and Cooper is dragged into a world of covert technology and killers who leave fake clues. The trail leads to Dr. Seraphine Vohl: brilliant, ice-veined, messianic. Teaming up with the Verdant Covenant, a doomsday cult, Vohl isn't just preaching apocalypse, she's building it-weaponizing bubonic plague, engineering delivery systems, and treating her own believers like lab rats.When Vohl raises the stakes still further and makes it personal, Cooper stops being an investigator and becomes something else entirely.One cult. One vision. One end.And one man standing between the Black Death and seven billion people who don't know they're already in the crosshairs.