There is no mystery in this world that the famous detective Fred cannot solve! But who can solve the mystery of Fred's evaporation from the secret room? The new journey has just begun, but Meng Chacha and Xuenuo Nuo encounter an unprecedented crisis: Bulu Buru betrays them and escapes with the soul-sealing artifact! The confused brother and sister met the famous detective Fred's assistant, Waffle. The elusive organization "Death Knights" has made the entire city panic. The "Wei of the Undead" who curses others to kill, the resurrected death row inmates, the crime notices on tombstones, the noble daughter who disappears in the fire... How can a demon hunter who has lost the help of his divine power deal with the opponents from hell? There is no unreasonable truth in this world. The truth is in "The Detective Who Disappeared in the Secret Room".
