Summary: Lord Peter’s brother is accused of murdering his sister’s fiance and Peter has to find the truth.
Dorothy Sayers is best known as an early 20th century crime novelist. But she was also a well known apologist, one of the intellectual founders of the modern classical education movement (which is popular among many Christian homeschooling groups) and was a friend of CS Lewis, Tolkien and many other better known authors.
Clouds of Witness is the second of the Lord Peter Wimsey books. It can be read as a stand alone books (and it is in the public domain so it can be found for free or cheap in ebook formats.)
Lord Peter is the middle child in an aristocratic family. His older brother is a Duke and a Peer of the Realm. His younger sister is an eligible young woman and engaged to married. Lord Peter has a hobby, solving crimes, especially murders. Being a detective is not particularly encouraged by his brother, but once his brother is accused of murder, it is a needed skill.