Conan, Kogoro, and Ran attempt to decipher a secret code that promises to solve the strange mysteries of Nakamura Manor. The unsuspecting sleuths have no clue that the goblins they hunt are very real.

A distraught man visits Kogoro about his murdered sister, but things just don't add up. A jewelry store heist and a car chase lead Conan back to the scene of the crime as another case unfolds.