From the back of the book.
You live in Tibet with your family. Once a year, your father travels with a caravan of people, ponies, camels, and dogs to far-away India. The caravan brings back yak wool from Tibet and beautiful silks from China to India, where they are traded for spices and tea. Your father's helper can't join him this year- are you brave enough to take his place? The caravan crosses a dangerous mountain range, and travels through places very different from your home. YOU choose what happens next.