In the late Qing Dynasty and the early Republic of China, the wealthy businessman Lord Ren dies unexpectedly, and rumor has it that he was killed by a “blood demon”. The deceased Lord Ren not only mysteriously “resurrects” and becomes known as the “blood demon”, but also kills several people. Police Captain Cao has no choice but to invite the Taoist Chief Qian He to conquer the evil spirit. After some magic practices, even Taoist Chief Qian He is powerless against the spirit. Following the threads of clues, Mao Xiaofang, a Mount Mao Taoist Priest, gradually discovers the truth of the matter. The mastermind behind the “blood demon killing” is actually Taoist Chief Qian He. It turns out that Taoist Chief Qian He’s disciples are entangled in strange diseases and need fresh blood to extend their lives. Hence, Taoist Chief Qian He came up with this method, first killing Lord Ren, and then having his disciples disguise as Lord Ren to create the illusion of a blood demon resurrection to confuse the public and take advantage of the chaos to kill and obtain blood. Mao Xiaofang and his disciples follow the clues and track down the hiding place of Taoist Chief Qian He. After a fierce life-and-death struggle, they finally subdue Taoist Chief Qian He, making him confess to his sins and face legal punishment…