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Substance D – otherwise known as Death – is the most dangerous drug ever to find its way onto the black market. It destroys the links between the brain’s two hemispheres, leading first to disorientation and then to complete and irreversible brain damage. Bob Arctor, undercover narcotics agent, is trying to find a lead to the source of supply, but to pass an addict he must become a user, and soon, without knowing what is happening to him, he is as dependent as any of the addicts he is monitoring.

‘SF Masterworks’ is a library of the greatest SF ever written, chosen with the help of today’s leading SF writers and editors. These books show that genuinely innovative SF is as exciting today as when it was first written.