In a nutshell the author has reviewed the voluminous data, (transcripts, interviews, personal logs and diaries, etc.) and has written a coherent and engaging book documenting an extremely convoluted and complicated foreign policy initiative, (actually several initiatives) during the Reagan presidency. Aid to the contras, weapons sold to Iran and the diversion of funds from those weapons sales are tracked from inception to implementation to the exposure of these "affairs". This includes all the high hopes and noble causes, the "zeal" of the Americans involved, the greed and corruption of the middlemen used for the transactions, and at times the sheer incompetence which led to the inevitable exposure of what was really happening behind the scenes. This last item being the crux of the book - the hijacking of US foreign policy in the Middle East and Central America by a handful of men, (at times overworked, completely over their heads and out of their league), outside of any purview, oversight or review by the White House, Cabinet or Congress. As for who knew what and when, from President Reagan on down, the author also does a very good job documenting this time line and each of the major players involved. (As an aside, Sec. of State Schultz's involvement, or really conscious lack thereof, was an eye opener for me.) As for the timeliness of re-visiting this affair 20 years later and any lessons to be learned, if any, .... All I know is I found this book both fascinating and a little scary.