Nightstalkers (MP3 format, CD, Unabridged edition)

Staff Sergeant Winthrop Carter only enlisted in the army for the steady pay. When he cheated on the Special Forces' final exam, he never expected his actions would get him drafted into the Nightstalkers - an elite team with a mysterious mission and even more mysterious leader. For decades, Rifts have been opening and unleashing bloodthirsty alien life forms into our reality. The Nightstalkers' goal is to shut down these breaches and stop the beings that emerge from rampaging out of control.