Mitchell Zukor is hired by a mysterious new financial consulting firm to calculate worst-case scenarios in the most intricate detail, and his schemes are sold to corporations to indemnify them against any future disasters. As Mitchell immerses himself in the mathematics of catastrophe, he loses touch with his last connection to reality: Elsa Bruner, a friend with her own apocalyptic secret. Just as Mitchell’s predictions reach a nightmarish crescendo, an actual worst-case scenario overtakes Manhattan. Mitchell is uniquely prepared to profit. But at what cost?