Grainger had acquired a second mind—he didn't want it and it had never asked him for permission. But the disembodied mentalism had invaded his brain during the crack space pilot's castaway months on the edge of the Halcyon Drift. The Halcyon Drift was a dark nebula within whose electronic chaos the laws of physics were so distorted that space ships could not explore within its vast borders without near-certain catastrophe. But somewhere within the cosmic darkness was the steady distress signal of a vessel lost many years before—a vessel laden with a treasure cargo that could make its finders powerful and wealthy. And it could be that Grainger's mental parasite might be the means by which he alone could penetrate the impenetrable.