The Moonstone by Wilkie Collins

A classic masterpiece of mystery novels!!
The first mystery novel in English literature.
It is a letter-type novel and is the first mystery novel in the history of English literature.
Instead of writing about murder or dramatic tension, which is a pattern of Sherlock Holmes or later mystery novels, it is written as an 18th-century epistolary novel, and each chapter tells the story of a different person, and the little clues are shown in the story make a shocking ending. Of course, movies and dramas are not made using the epistolary technique.