David Walton

David Walton writes science fiction that turns difficult scientific ideas into pressures on families, institutions, and individual identity. Supersymmetry, published by Pyr in 2015, is the second novel in his Superposition sequence. Set fifteen years after the first book, it follows physicist Ryan Oronzi's development of quantum military technology and the return of the varcolac, a creature able to exploit that work. Sandra and Alex Kelley, two continuing versions of Alessandra Kelley, face a conflict in which defeating the threat may require them to become one person again. Walton grounds the speculative plot in physics vocabulary while using the divided sisters to explore responsibility and selfhood. The book is a 303-page trade paperback distributed by Simon & Schuster, with ISBN 9781633880986. Walton's wider bibliography includes Terminal Mind, Quintessence, Quintessence Sky, Superposition, and The Genius Plague. Terminal Mind shared the 2009 Philip K. Dick Award, establishing his interest in technically informed stories before the Superposition novels joined quantum theory to thriller pacing and family consequence.