Beijing, 2008, the Olympics are coming, but as taxi driver Wang circles the city’s congested streets, he feels barely alive. His daily grind is suddenly interrupted when he finds a letter in the sunshade of his cab. Someone is watching him. Someone who claims to be his soulmate and to have known him for over a thousand years.

Other letters follow, taking Wang back in time: to a spirit-bride in the Tang Dynasty; to young slaves during the Mongol invasion; to concubines plotting to kill the emperor; to a kidnapping in the Opium War; and to Red Guards during the Cultural revolution.

And with each letter, Wang feels the watcher in the shadows growing closer…