Khan: Empire of Silver by Conn Iggulden

This is the four book in The Khan Series of 5: Genghis; birth of an Empire, Genghis: Bones of the Hills, Genghis: Lords of the Bow, Khan: Empire of Silver, Conqueror. 
 
The Great Genghis Khan has been murdered by one of his own. Ogedai, Genghis's son is next in line to rule. All of Mongolia's nobles and warriors gather in the city of Ogedai's creation, Karakorum to swear allegiance to the new Khan. Everyone but his sworn enemy and brother, Chagatai. 
This tale leads you on the Mongol campaigns from Russia, Hungary and into Serbia. Just as the northern reaches of Italy are within sight,news from Ogedai changes all plans and position. 
Conn Iggulden weaves a compelling and rich tale that leaves you with a deep understanding of the characters and their time and place. A great read.