[Machine Translation] An unidentified human finger was sent to the home of detective Junpei Takasugi of the Nishi Asakusa Police Department. A few days later, a body with a missing index finger is found, and in his pants pocket is a piece of paper with a picture of a monkey on it. The murders continue. The "suspects" are killed one after another. Who is the real murderer? And what is the other incident "The Finger Speaks" about? The first in a long-awaited collection of the famous police novel series by one of the most popular historical writers of the day.