Marble Hall Murders – Anthony Horowitz

Although this book has classical crime fiction tropes, the structure is unique because it is a book within a book. An editor is hired to help an author complete a whodunnit in 1955, but the unfinished manuscript contains clues as to the possible murder of the author’s grandmother. In other words, there are many clues about his grandmother’s death in his manuscript. And there are lots of clues that are red herrings, and there are even anagrams! Overall, a very entertaining read.