Empire of Angels

What is up there? Do all souls go to heaven? Can humanity be saved?
Pioneers of "posthumous geographical discoveries" Michel Pinson and Raoul Razorbak meet again to continue the epic of thanatonauts. They are to practically learn all the intricacies of the angelic craft and understand the hazy heavenly hierarchy. But they wouldn't be true researchers if they stopped there. Where do angels go after fulfilling their purpose? Who makes decisions above the angelic realm? And what if the answers to these questions are hidden in other galaxies?