Murders in the Tower of Five Elements

This whimsical residential pyramid is dedicated to the five elements. The four floors symbolize earth, fire, water, and wood – and are built using these materials. The fifth floor – the top of the pyramid. It consists of just one... room, entirely made of copper imitating gold – the concluding element.
 
Even during its construction, the Tower of Five Elements became embroiled in rumors. It was said to be cursed and drives those who reside in it mad. The first owner paid no attention to this; on the contrary, he believed that living in the "Golden Room" would bring him incredible luck. Until one day he opened the window and jumped into the darkness. Later, the second owner followed his example…
 
Lin Zhen, the son of the last owner, is convinced that his father did not commit suicide. He is not even bothered by the fact that the "Golden Room" was locked from the inside at the time of the incident. To understand the mystery of his parent's death, Zhen decides to spend the night in it, and… also dies. Soon the tower collapses during an earthquake, burying under its debris the hope of unraveling the three strange deaths. However, this does not seem to hinder the brilliant mathematician and detective Chen Jue, who is approached for help by Zhen’s sister…