The reader, en route to the third planet from Altair to seek the source and meaning of extraterrestrial messages, is given choices to make determining the course of the spaceship and the survival of its crew.
- ISBN10 0397318847
- ISBN13 9780397318841
- Publish Date 1 January 1979
- Publish Status Out of Print
- Out of Print 4 December 2012
- Publish Country US
- Imprint Lippincott Williams & Wilkins
- Format Hardcover
- Pages 96
- Language English