While at his office, Kogoro receives a request from Kanae Kaetsu, a client whose mother's brooch was stolen. They have to follow letters left by the robber to find out the truth.

While at a park, Conan and the Detective Boys discover a cat covered in injuries that was abused by someone. They decided to search for the culprit based off the blood and fibers left on the cat`s claws. Meanwhile, the head receptionist is found dead at Bocchan Restaurant. His shirt is strikingly similar to the fibers found in the cat`s claws...