Heechee Rendezvous

Blurb

Heechee Rendezvous is a science fiction novel by the American writer Frederik Pohl, published in 1984 by the Del Rey imprint of Ballantine Books. It is a sequel to Gateway and Beyond the Blue Event Horizon, and is set about two decades after the former. It has been cataloged as the third book in a 6-book series called Heechee or The Heechee Saga but Kirkus reviewed it as completing a trilogy and a German-language edition of the three books was published after all six were out as the Gateway trilogy.
Readers of Locus ranked Heechee Rendezvous third in the 1985 poll to confer the annual Locus Award for Best SF Novel.