Children of the village of Ku-Fu from eight to thirteen years old were poisoned by the poison “ku”. The Tenth Bull finds Li Kao in Beijing, a sage “with a slight flaw in character,” and they set off to find an antidote. To do this, they need to obtain the Great Root of Power, but it is not so easy. Powerful forces are involved, and an ordinary journey turns into a big puzzle with many secrets. It will be very difficult for the heroes, and with each step towards the truth the trials only become more difficult...