Time travel is a literary concept that can be traced back to H.G. Wells, but with the many-worlds theory writers today face increased demands on the logic of their stories if they want to maintain credibility within the text. Jeff Evans discusses the concept and the challenges the writer faces when embarking on a time-travel story, drawing examples from Tim Powers’ The Anubis Gates, Charles Stross’ “Palimpsest” and Mary Robinette Kowal’s “First Flight.”