I nominate The Nightland by William Hope Hodgson
http://www.gutenberg.org/ebooks/10662
I nominate Roadside Picnic by the Strugatsky Brothers
https://en.wikipedia.org/wiki/Roadside_Picnic
I nominate Consider Phlebas by Iain M. Banks
https://en.wikipedia.org/wiki/Consider_Phlebas
Is three allowed?