Frankenstein Unbound — Brian W. Aldiss

A disruption of time and space sends a modern man back two hundred years to confront Dr. Frankenstein's immortal monster in this brilliant reinvention of Mary Shelley's classic tale

Some years into the twenty-first century, a newly devised weapon of mass destruction will do far worse than kill; it will disrupt time and space. Suddenly, land, buildings, animals, and people are falling through “timeslips” and being transported briefly back to earlier eras. One of these inadvertent time travelers, Joe Bodenland, is shocked when he finds himself parked outside a villa on the shore of Lake Geneva -- and soon after, unbelievably, in the presence of nineteenth-century literary luminaries Lord Byron and Percy Shelley, along with Shelley's very enticing fiancée, budding author Mary.
 
But when Joe comes face to face with a real, flesh-and-blood Victor Frankenstein and the monster the mad doctor brought into this world, the visitor from the future realizes that not only has time been disrupted, reality itself has been transmogrified. And this Frankenstein, it seems, is far from finished with his unholy endeavors, leaving it up to Joe to make it right for the sake of history -- and for the bewitching lady novelist who has stolen his heart -- before he is rudely thrust back to his own time.
 
An absolutely stunning reinvention of a cherished literary classic, Frankenstein Unbound proves once more that there are no limits to the unparalleled creative genius of science fiction Grand Master W. Brian Aldiss, one of the most revered names in the field of speculative fiction.