Shadows of Eternity - Gregory Benford - Bog

"Humanity has established a SETI library on the moon to decipher and interpret the many messages from alien societies we have discovered. The most intriguing messages are from complete artificial intelligences. Ruth, a beginner Librarian, must talk to alien minds who have aggressive agendas of their own. She opens doors into strangeness beyond imagination and in her quest for understanding nearly gets killed doing it"--