Richard receives a letter asking him to solve the mystery of a mansion. There, Richard, Conan, and Rachel meet Misao Nakamura and his brother. The entire mansion is filled with clocks since the previous owner, the brother's grandfather, was a clockwork artisan. Conan notices the strange mysteries - every digital clock is scratched between the two-minute digits, drilled holes are everywhere, a mirror is glued to a desk, every clock rings for one minute at 11:00, and there's someone hiding in the attic. At 1:10, three goblins figures appear from the cuckoo clock in the office.