https://groundzeromedia.org/1-25-21-the-beacon-of-the-overlords-w-avi-loeb
What if intelligent life exists on more than one world?
https://www.goodreads.com/book/show/48930288-extraterrestrial
What if some intelligent ET civilizations have been around for the equivalent of millions of solar years?
https://www.sciencefriday.com/segments/avi-loeb-extraterrestrial-life
https://www.cfa.harvard.edu/~loeb
Some might be interstellar explorers...
https://www.waterstones.com/book/extraterrestrial/avi-loeb/9781529304824
What if some of that intelligent ET life has a deceptive or Trickster component to it?
https://www.waterstones.com/book/passport-to-magonia/jacques-vallee/9780987422484
https://www.goodreads.com/book/show/406344.Passport_to_Magonia