Theoclea (The Delphic Oracle) and Pythagoras in Eleusis and Atlantis

In this book, a seminal book in the Theoclea series, we see Theoclea as a child, as she experiences her first vision of the future. The book moves on to a time when she has become The Delphic Oracle and gives the speech of a lifetime to a huge crowd before the Mysteries of Eleusis begin. The second part of the book moves on as Theoclea and her friends--her teacher, Pythagoras; Vorios the Magician; Morain, her Counselor, and Panelle, her Guardian/Protector see Atlantis. In the end, we know and see Atlantis as well