Plague Ship

STAR-CURSED! In the field of interstellar commerce, where trade was pretty well sewn up by the giant companies, tramp-freighter spaceships like the Solar Queen were up against it. Their only tools were ingenuity and personal fearlessness, the qualities that had gained the Solar Queen exclusive trading rights to Sargol and its fabulous gems. But those qualities were to be strained to the breaking point to meet Sargol's three challenges. First was the enigmatic obstinacy of the catlike natives. Second was the ruthless incursion of an illegal competitor. But the third and worst was to be the invisible, indetectable stowaway that would brand the Solar Queen anathema to all inhabited worlds.