The Rings of Tantalus(1975)
(The second book in the Expendables series)
A novel by Richard Avery (Edmund Cooper)
First they went to KRATOS - and faced the Deathworms. Then they went on to TANTALUS and tried to fathom the rings - which could only have been fabricated with the help of highly sophisticated machinery. And then they discovered an alien spaceship orbiting the planet in strict silence and uncommunicability.
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Used availability for Edmund Cooper's The Rings of Tantalus
August 1975 : USA Mass Market Paperback
1975 : USA Paperback
September 2011 : UK Kindle edition
Title: The Expendables: The Rings of Tantalus: The Expendables Book 2
Author(s): Edmund Cooper
Availability: Amazon UK