On the fourth day of June in the ninth year of Wude, Chang'an City had not yet woken up, but Zhao Twelve, the guard at Xuanwu Gate, discovered that the guards at the palace gate, the knights coming and going, and every password were different from the past. Prince Li Jiancheng and King Qi Li Yuanji were summoned to the palace, but King Qin Li Shimin had made the last move in the dark. An unrecorded pawn was thus involved in the most dangerous morning of the Tang Dynasty, and witnessed with his own eyes how the fate of the empire was completely rewritten inside and outside a door. Historical facts are the bones, suspense is the thread, and in twelve hours, a power showdown will determine the future of the Tang Dynasty.
