Case Closed: Season 1, Episode 161

1 - 161: The Murder Floating in Ryusuitei

Kogoro, Ran, and Conan are at a fancy traditional Japanese restaurant where food is delivered on a small computer controlled boat that navigates over a running stream around the restaurant. Later, a murder occurs and Conan realizes the only way it could have been possible was for a person to be alone, and to use the stream to access the room.