roughly spherical dustcloud, maybe a light-year in diameter, about ten parsecs from Ansa toward Sagittari. A few colonized stars on its fringes, nothing inside it as far as anyone knows. It has a bad name for some reason. The superstitious say it's haunted, and you hear stories of ships disappearing—Well, it gets a pretty wide berth. Not much out there anyway."

His mind was racing, he thought he could almost hear it click and whirr as it spewed forth idea after idea, memory after memory. Valduma and the blackness and they who laughed. The Nebula is pure poison, and now the Empire is getting interested. By God, it might poison them! Only would it stop there? This time they might decide to go on, to come out of the blackness.

Jansky's voice seemed to come from very far away: "You know more than that, Donovan. Intelligence has been sifting Ansan records. You were the farthest-ranging space raider your planet had, and you had a base on Heim, at the very edge of the Nebula. Among your reports, there is an account of your men's unease, of the disappearance of small ships which cut through the Nebula on their missions, of ghostly things seen aboard other vessels and men who went mad. Your last report on the subject says that you investigated personally, that most of your crew went more or less crazy while in the Nebula, and that you barely got free. You recommend the abandonment of Heim and the suspension of operations in that territory. This was done, the region being of no great strategic importance anyway.

"Very well." The voice held a whipcrack undertone. "What do you know about the Black Nebula?"

Donovan had fought his way back to impassivity. "You have about the whole story already," he said. "There were all sorts of illusions as we penetrated, whisperings and glimpses of impossible things and so on. It didn't affect me much, but it drove many toward insanity and some died. There was also very real and unexplainable trouble—engines, lights, and so on. My guess is that there's some sort of radiation in the Nebula which makes atoms and electrons misbehave; that'd affect the human nervous system too, of course. If you're thinking of entering it yourself, my only advice is—don't."

"Hm." She cupped her chin in one hand and looked down at the papers. "Frankly, we know very little about this Galactic sector. Very few Terrans were ever here before the war, and previous intercourse on your part with Sol was even slighter. However, Intelligence has learned that the natives of almost every inhabited planet on the fringes of 

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