What to read after Zenith-D?

To the crew of the Exploratory Ship Canopus, outward bound on the first intergalactic voyage to the flaring suns of mighty Andromeda, the evil whisperings that spilled out from the nebula into deep space came as a warning. This was something far beyond their previous experience. Nor were they the only ones to come under the malignant influence of the alien intelligence.

In the empty, murmuring void, virtually half-way between the two galaxies of stars, a solitary sun streaked away from Andromeda, dragging its lonely, ammonia-laden planet with it. And it was here that the explorers first gained their glimpse of the black horror that lay straddled across the intergalactic darkness. Something that had being. Something that existed where it seemed impossible that anything could.

It fell on Klau-Telph, the only non-Terran on board the Canopus, to finally track down and destroy the inhuman monster that threatened to drive the inhabitants of a trillion planets over the red edge of madness. Not until it was done did he find that the hidden reason behind the insidious whisperings was not what it seemed. In fact, it was something that even he, with his strange double mind, had never thought possible...