The shadow before

Lester Dunn led a rather drab, unremarkable life as the owner of a not very prosperous pharmacy in a not very affluent London neighborhood. Grant Livesey lived a life of quiet luxury: well-appointed house in the country, fine car, tailored clothes, and an impressive portfolio of investments. Yet, Lester Dunn and Grant Livesey appeared to be the same person. Could the brain operation performed on Dunn have changed him into Livesey? Could one of his existences be merely a dream? Or could it be a frightening premonition of a disaster he was fated to bring upon himself?