Science fiction harbors an unfortunate subgenre wherein time travel is used to explain away the creative genius of past artists. A sample of his work might be brought to a master before "he" has created it; he might be exposed to another era and thus to events that then inspire his (now unimaginative) work. Aldiss ( Greybeard ), winner of the Hugo and Nebula awards, here sails very close to that wind. Dracula sends assassins to kill Bram Stoker before he can write his novel about vampires. Joe Bodenland hijacks a time train from the vampires and rides it to London in 1896, where he teams up with Stoker. Together they set off to save humanity from the undead, with assistance from Stoker's gardener and Bodenland's family.