The Sentence is Death by Anthony Horowitz
In this very clever mystery, private investigator Daniel Hawthorne summons writer Tony Horowitz to a house on the edge of Hampstead Heath where a divorce lawyer has been killed with an expensive bottle of wine in the sequel to The Word is Murder. Horowitz is supposed to editing a tv script for Foyle’s War, but instead is playing Watson to Hawthorne’s Holmes as he tries to solve the mystery before Hawthorne or the threatening Inspector Grunshaw. Three cavers, a single mom, an art gallery owner, and a successful poet are all connected to the victim, Richard Pryce. Horowitz, with a book contract to write about Hawthorne, is quickly in over his head, getting in trouble at a bookstore, persuaded to attend a book club where no one wants his opinion on the mystery being discussed, and stumped by false leads on why the number 182 is painted on the wall near Pryce. Suspenseful, intriguing, and occasionally funny, with an excellent audiobook narration by Rory Kinnear; I found this a very compelling read.