The Secret Sharer

The story originally appeared in Isaac Asimov's Science Fiction Magazine, September 1987 and was released as a chapbook the following year. It can also be found in the collections The Collected Stories of Robert Silverberg Volume 1: Secret Sharers (1992), Sailing to Byzantium (2000), Multiples: 1983-87: The Collected Stories of Robert Silverberg, Vol. 6 (2011) and First-Person Singularities (2017).