The Dark Heart Gateway, Damian Graaf #2

The Dark Heart Gateway is a space fiction involving characters from Peter Henkal’s Damian Graaf #1: Akira the Enigma.

After developing a new series of supersonic aircraft, Damian’s clone Graaf takes some Humanoid Test Pilots on a mission to a distant planet, where they discover a strange set of buildings.

Is it possible that a higher civilization exists in deep space?

(Unabridged- Adult content)