Three episode story arc. Conan and Ran accompany Mouri on a case. He has been asked to investigate strange deaths from a few years ago that were attributed to the Spider Monster's Curse. The residents are afraid the Curse will claim another member of their family. Mouri is not the only detective on the scene, since Hattori recieved a letter from another family member asking him to solve the case. Together Hattori and Conan must find the culprit when the oldest brother is found dead, suspended in a spider web.