All the Horses of Iceland by Sarah Tolmie

Everyone knows of the horses of Iceland, wild, and small, and free, but few have heard their story. All the Horses of Iceland tells the tale of a Norse trader, his travels through Central Asia, and the ghostly magic that followed him home to the land of fire, stone, and ice. His search for riches will take him from Helmgard, through Khazaria, to the steppes of Mongolia, where he will barter for horses and return with much, much more.