PHILIP K. DICK: A Scanner Darkly by Philip K. Dick / Classic Sci-Fi Novel / Science Fiction  'Bob' is a drug dealer and user selling a drug known as 'SUBSTANCE D' - he is targeted by Law Enforcement Officials and Special Agent 'Fred' is given the task of taking this dealer down - but in this convoluted science fiction story - the problem is: Bob and Fred are both the same person.... thanx to 'SUBSTANCE D' ....  Mariner Books Release - 2011 Edition - USED PAPERBACK BOOK in VG Condition - light cover wear - pages clean & tight - PRICE: $18.00 - Price Includes Shipping - *No International Orders Please.