“Betrayer of Worlds” by Larry Niven and Edward M. Lerner.
Title: Betrayer of Worlds
Series: Fleet of Worlds, Known Space
Number in Series: 4 (four), n/a
Author(s): Edward M. Lerner, Larry Niven
Cover Artist: Stephan Martinière
Language: English
Original Publisher: Tor Books
Originally Published: October 2010
Publisher: Tor Books
Published: June 2011
ISBN-10: 0765364980
ISBN-13: 9780765364982
Notes: Part of a prequel series to the Ringworld series.