The Ghost Light of Binary Stars (bloodymary monster romance)

In their new explorations the Eridians find a strange world with a human machine floating on the surface. After bringing it back Ryland discovers English writing and seemingly Earth technology. When they travel to the moon to further investigate they find nothing but a strange tree that attacks them. Inside the tree is a man- screaming in anger and refusing to give up.

When they extract Simon from the blood tree he's disoriented and can't believe where he is. Another hallucination? When he sees Ryland and Rocky he refuses to believe they're real- until he sees himself. He's changed. Half monster, half man.

But the stations are still floating in space. How did they get here? Why did they travel through space and time? What changed Simon, and is it contained to that moon, or will it spread across the Galaxy?