Suvi, the president of SEA Chamber of Commerce, was killed in a locked room during his meeting with Watanabe, the president of the Black Dragon Gang.
All the evidence indicates that Watanabe is the only suspect. Tang Ren, Qin Feng, Hiroshi Nada and Thai detective Tony find things suspicious and start to investigate, but there are many obstacles. Qin Feng is accused of kidnapping Suvi's secretary and sent to jail... Can Qin Feng escape from jail and find the real murderer? What is the ultimate secret hiding behind the crime?