Nightmare Blue: the most addictive drug in the universe. The alien race known as the Aensalords alone know from whence it comes, and are its sole purveyors. Already its effects are visible on Earth—in the stark, raving eyes of the hopelessly addicted and enslaved. Now two agents set out to find the source: Jaeger, the last private detective in the peaceful world of the future, and Corcail Sendijen, a lobster-like alien once a servant of the Aensalords themselves. But Earth alone is not all that is at stake—for it seems humans are merely test subjects, and the Aensalords have plans that could endanger the entire galaxy.

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"My generation of writers has produced relatively few authentic masters. . . Gardner Dozois is one of them."—William Gibson