| Tor Books, October 3, 2006, cover price $25.95 | About this edition:
An odd assortment of diplomats--including a linguist with a multiple personality disorder, a biologist spliced to machinery, a pacifist warrior, and a vampire--journey to the far edges of the solar system to seek out a mysterious alien presence that may or may not want to meet with them and that may or may not be friendly toward Earth.
| Createspace Independent Pub, February 28, 2016, cover price $22.99 | About this edition:
Who do you send to meet the alien when the alien doesn't want to meet?
| Createspace Independent Pub, November 13, 2015, cover price $20.99 | About this edition:
Description Notice: This Book is published by Historical Books Limited (www.
| Createspace Independent Pub, October 5, 2015, cover price $13.99
| Reprint edition (Tor Books, March 4, 2008), cover price $17.99
| 1 edition (Tor Books, April 1, 2010), cover price $9.99