I just finished Wilderness of Mirrors by David C. Martin.

Wilderness of Mirrors loosely follows the careers of James Angleton and William Harvey, and the respective effects they had on the fortunes of the CIA during the Cold War.



It's a very loose book - very anecdote based, but the anecdotes are quite interesting, so it works out.  It's interesting that a lot of the Cold War mysteries about which defectors were double agents and which ones were genuine still haven't been settled.