A science fiction novel by Joe Haldeman - Awarded the Nebula Award. For a million years, two extraterrestrial beings have been secretly walking on our Earth. These creatures know nothing of each other, but they share something in common: a final memory of a mysterious, sunken relic and a connection to water. One being, the changeling, has survived through adaptation by taking on the forms of various organisms. The other, the chameleon, has survived solely by destroying everything and everyone in its path. When marine biologist Russell Sutton finally discovers the relic and brings it to the ocean's surface, it calls out to the two creatures, urging them to come home. Finally brought together by the relic after countless generations, the chameleon decides that there is only room for one on this world.