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Robert Hanssen's motives are some of the most complex in American espionage, and Wise offers decent thoughtful insights on them while covering a lot of ground in great detail; however, the background information sometimes seems irrelevant. I'm not into Wise's writing style(and the last chapter is garbage), but this is probably the best book available on Hanssen due to Wise's research efforts - supposedly he interviewed some 150 key individuals and was, after Hanssen's approval, given exclusive access to the psychiatrist assigned to Hanssen, Dr. David L. Chartney. That last part's from the back cover.