Aoléon the Martian girl. Part five, The great Pyramid of Cydonia
(Book)

"Aoléon, Gilbert, Bizwat, Helios, and Zoot make it to their final destination - Cydonia - where Aoléon's parents are being held captive. They infiltrate a secret underground base and are confronted by a small army of sentrybots. Bizwat lends Aoléon and Gilbert some of his advanced combat skills via a psionic brain dump. However, this may not be enough to save them from overwhelming hostile forces that will do anything to stop them.They finally meet PAX - the Martian who originally set them out on the mission to discover the truth about the Luminon and his plans to invade Earth. However, PAX is not who he seems to be, and through a turn of events, they uncover the true power behind all that has been happening on Mars. Will they be able to rescue Aoléon's parents and save Earth from invasion? Read the exciting conclusion to this series to find out!"--Amazon.com.