Xiao Longnu is attacked in a frigid pool and falls unconscious after being struck by a strange poison.
Yang Guo searches for renowned doctors throughout the land, only to be told that the legendary “Nine-Turn Soul-Reviving Herb” is the only cure.
Sixteen years later, Yang Guo's son, Yang Kang, accidentally discovers that his mother's poisoning is connected to Mongol spies.
To save her, Yang Kang sets out in search of an antidote, only to become entangled in a shocking conspiracy.
Outside Xiangyang, Mongol cavalry bears down on the city as Guo Jing and Huang Rong lead the people in a desperate defense.
Can Yang Guo and his son bring back the antidote in time?
And hidden behind the cure is a secret that could overturn the entire martial world...
