Case Closed: The Fist of Blue Sapphire

Case Closed: The Fist of Blue Sapphire (2019) is a animation, mystery, crime directed by Chika Nagaoka rated 6.2/10.

The world's greatest blue sapphire, the "blue lapis fist", said to have sunk in a pirate ship in the late 19th century, on the coasts of Singapore. A local millionaire plots to retrieve it, and when it's exhibited in an exhibition at the Singaporean Marina Sands hotel, a murder takes place.