Several of her works feature time travel by history students at the future University of Oxford, called the Time Travel series or the Oxford Time Travel Series. They are the short story "Fire Watch" (1982, also in several anthologies and the 1985 collection of the same name), the novels Doomsday Book and To Say Nothing of the Dog (1992 and 1997), and the two-part novel Blackout/All Clear (2010). All four won the annual Hugo Award, and Doomsday Book and Blackout/All Clear won both the Hugo and Nebula Awards, making her the first author to win Hugo awards for all books in a series.
