Uncle Grigorian, who turns out to be an alien, takes the Price twins and their cousin Tubs to the capital of the Galactic Empire, where they serve as unbiased arbitrators in the Worm War.
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October 1990 : USA Hardback
January 1990 : USA Hardback
September 1991 : USA Paperback
1992 : USA Audio Cassette
Title: The Power Twins -- Unabridged audio cassettes.
Author(s): Ken Follett
ISBN: 0-7366-2153-9 / 978-0-7366-2153-3 (USA edition)
Publisher: Books on Tape