Like most others who read Iggulden's works, I have read both Emperor also. At first I couldn't see Genghis Khan being as easy to adapt to as the legendary figure of Julius, but Conn Iggulden simply proved most of us wrong.
Iggulden has the skill to make a flowing piece of historical fiction which brings to life personalities of epic figures in history whom we all wish we could understand on a more human-level. This book continues explaining how Genghis turns from boy to a ruthless and legendary figure and that development carries the book series from strength to strength.
One note I feel is work mention is that as with the Emperor series we start to see a slight detachment from what Genghis is feeling inside, and his emotion seems to become detached and what he feels seems to be explained more by his generals than Iggulden's direct explanation of his thinking. I suppose this makes sense considering it creates a more substantial aura of the Khan, changing into a figure beyond belief. I personally found it worked, but missed the opportunity to be told his direct feelings unlike his childhood in the earlier books.
All in all it is a brilliant piece of writing, and no one can bring historical figures like this to life like this author. Enjoy the read!