Everyone in My Family Has Killed Someone by Benjamin Stevenson

 

So, this book is doing weird things in the meta--one of the conceits is that the first-person POV character, the "I" of the novel, has written "how to write a mystery novel" books, so the narrator goes to great lengths to demonstrate that he's "playing fair." That ... strangely, doesn't interfere with this working as a reasonable modern take on a Fair Play Mystery, at least to my not-deeply-involved-in-the-genre taste, without at all coming across (to me) as anything like a satire. The voice is reasonably engaging, and the characters are ... fun to find in a book, though I honestly wouldn't want to spend more real-world time with them than necessary.