The book unveils a long-lost monograph by Sherlock Holmes on the Posthumous Motets of Orlandus Lassus, rediscovered by musicologist Michael Procter in the Bavarian State Library. Procter not only presents Holmes' notes but also provides insightful annotations and essays that explore themes of melancholy and depression in relation to both Lassus and Holmes. Additionally, it offers references to Holmes' life and notable cases, enriching the understanding of the detective's character and his connection to music and emotion.
