When Pandora's box was opened, the gods shoved the demons that escaped into the bodies of the warriors who released them. Now those immortal warriors live on Earth, trying to keep their demons under ocntrol while avoiding human demon hunters who want them dead.
In the near future, Earth is a reluctant home for a number of alien species and the Alien Investigation and Removal Agency deals alien-related problems. But when the human team and the aliens begin to get too emotionally attached, bad things can happen.
Deep in the Amazon jungle is a portal to the ancient land of Atlantis, home to vampires, shapeshifters, and other creatures out of myth.
This series is set in the same world and time as the Lords of the Underworld series, and has some characters in common.