In the previous book in the series "2022; The Return of the Annunaki", the Annunaki mysteriously disappeared when they were on the cusp of deciding mankind's fate as custodians of Planet Earth. Their decision was based on whether mankind was the right species to ensure the survival of the planet into the future. Their concern was not for mankind, but for the long-term survival of the planet and whether we, as a species would be able to rectify the environmental damage we had already caused and return the Earth to an equilibrium.
The Annunaki were a telepathic species and in their time observing Earth they had interacted with us, enhancing the telepathic ability of some and increasing many to match their own IQ of 250. The chosen telepaths that remained after the disappearance of the Annunaki were by earth standards geniuses with a score well above that of Einstein and they had a commitment to ensure the environmental well-being of the planet. Some saw them as saviors while others saw them as the spawn of the Annunaki to be exterminated, The Annunaki had left; but their progeny remained.