It sounds like you might dig Legacy of Ashes by Tim Weiner. A lot of what he wrote is heavily contested. I don't know enough to evaluate those claims.

You can understand both good and bad reasons why he would have errors. The CIA's work is classified a lot of times, so he had to piece the stories together indirectly. So mistakes are understandable. If the criticism of bias is more accurate that's a different issue, but you'd have to read reviews of his book and probably read a lot to get an idea of how much bias has had an impact.