On a sweltering Chicago afternoon, a lost piano masterpiece surfaces on a set of World War I-era wax recording cylinders. The dazzling piece is years ahead of its time, more Coltrane than Debussy—how could it be? Brought low by a painful divorce, renowned classical music producer Ben Weil throws himself into unlocking the sonata’s mysteries. But when a famous pianist stumbles upon the work and takes credit for unearthing it, Ben’s swept into a lie that could shatter his reputation and his private life at a stroke. Somehow he must find a way to tell the truth—a dangerous quest that will lead him not only to the sonata’s surprising origins, but to his own.