A mutant species from the sea unleashes a tide of terror in this horror thriller from "one of the most important science fiction authors" (SF Site).

In Double, Double, a random collection of strangers converges on a seaside town, not knowing one another and having nothing in common. A mystery from the sea, a shape-shifter, begins to take over the people and produce oddly behaving duplicates of them. A combination of scientific knowledge and a little luck may be all that stands between mankind and an alien invasion.

For each generation, there is a writer meant to bend the rules of what we know. Hugo Award winner (Best Novel, Stand on Zanzibar) and British science fiction master John Brunner remains one of the most influential and respected authors of all time, and now many of his classic works are being reintroduced. For readers familiar with his vision, this is a chance to reexamine his thoughtful worlds and words, while for new readers, Brunner's work proves itself the very definition of timeless.