While hiking, Conan and his friends meet campers Eiko, Ashizuka, Hayashida, and Takemi at a mountain cottage. The four of them have gathered to commemorate the death of their friend Motoki who accidentally fell to their death three years ago. Takemi, who camped by herself in a tent at the bottom of a cliff, is found murdered the next morning!

Real estate company president Hiyama is murdered while holding a pair of scissors invented by Agasa, so Conan and Okiya accompany Agasa to the crime scene. The man who discovered the body is former candy shop owner Senba. Agasa suspects Senba is the murderer, but it was impossible for Senba to have entered the house with a weapon. The current case closely resembles a 17 year old case in several ways, such as the murder victim holding scissors and the sink left running at the crime scene. Conan and Okiya watch as Senba recreates the steps he took when he discovered the body and notice several contradictions...