In England at the end of the 19th century, unsolved mysteries were hidden in the fog of London, and silent secrets were hidden along the stone paths in the countryside. This was the era when Sherlock Holmes was active. The stories in "Unsolved Mysteries" are in the same time and space as those legends, but they hide another way to understand the truth. The narrator of these cases is Arthur Clement, a retired Scotland Yard detective who now lives in seclusion in the English countryside. This collection contains exactly the unsolved cases I heard from Arthur: the missing pearls in the manor, the unknown gentleman in the back alley of the church, and the secrets in the miller's will... Each story begins with a cup of hot tea handed over by him and ends with a thorough interpretation of human nature. Nowadays, these stories are compiled into a collection not only to preserve the mysteries that have been forgotten by time, but also to remember Arthur Clement's "philosophy of solving crimes": rather than the fragments of physical evidence, the pattern of the human heart is the key to unlocking all unsolved cases. If you are willing to make a cup of hot tea, you may be able to understand, like me, the human nature in these stories that is more moving than the truth.