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<p><p>bob Arctor Is A Dealer Of The Lethally Addictive Drug Substance D. Fred Is The Police Agent Assigned To Tail And Eventually Bust Him. To Do So, Fred Takes On The Identity Of A Drug Dealer Named Bob Arctor. And Since Substance D&#151;which Arctor Takes In Massive Doses&#151;gradually Splits The User's Brain Into Two Distinct, Combative Entities, Fred Doesn't Realize He Is Narcing On Himself.<p>caustically Funny, Eerily Accurate In Its Depiction Of Junkies, Scam Artists, And The Walking Brain-dead, Philip K. Dick's Industrial-grade Stress Test Of Identity Is As Unnerving As It Is Enthralling.</p>