Singularity. Brooks Hammer, #13

Jack St. James lives off-grid in the Yukon Territory, writing on a 1943 Remington typewriter, hiding from a digital world he knows is fragile. When shortwave radio reports simultaneous encryption failures across global banking, aviation, and military networks, Jack understands immediately: a quantum computer has been stolen. The Q-Core can collapse every encryption system on Earth in milliseconds.
His former student Elias Voss has hidden the machine in a Romanian salt mine and launched a 48-hour countdown designed to erase every digital record, identity, and encrypted system on the planet. Jack assembles a ghost team, descends into the mine past quantum sentinel drones, and confronts Voss. The algorithm has already escaped. Jack's solution is analog: broadcast deliberately flawed math across radio bands, flooding the cascade with human error until it collapses under its own contradictions.
Book thirteen introduces the mathematician who fights with uncertainty.