Embassytown
by China Miéville
Embassytown takes place mostly in the city of the title, on the planet Arieka. It exists on the very edge of the known universe, which given its distance from everything else, is only accessible by sailing through the "immer" (see § Style below for the meaning of Miéville's neologisms). Embassytown is a colony of a state called Bremen; and its trade goods (precious metal and, especially, alien-influenced biotech), along with Embassytown's unique position at the edge of the known universe, make it a particularly important colony.
Avice Benner Cho, an "Immerser" (a traveller on the Immer), has returned to her childhood home from her adventures in the "Out". On the planet of Arieka humans and "exots" co-exist with the indigenous, enigmatic Ariekei—otherwise known as the Hosts. Few people can speak the language of the Hosts (referred to only as "Language"), as it requires the orator to speak two words at once; those humans (Terre) who can are genetically-engineered twins known as Ambassadors, bred solely for this purpose. The Ambassadors speak with two mouths and one mind and as such can be understood by the Ariekei (who do not recognise any other form of communication) allowing for trade in their valuable biotechnology. The Hosts' Language does not allow for lying or even speculation, the Language reflects both their state of mind and reality as they perceive it; they create literal similes by recruiting individuals to perform bizarre ordeals that can then become allusions in Language. Avice herself serves as a human simile, “the girl who was hurt in the dark and ate what was given to her". Ariekei compete at Festivals of Lies to see who can most closely approximate speaking an untruth, an act both thrilling and highly taboo.
The relationship between humans and Ariekei has proceeded in relative tranquillity for many years (kilohours). However when a new Ambassador arrives, named lose their addictive properties.