As I write, a copy of The Hallmarked Man sits beside me. Not being on holiday, spending the morning reading a new detective novel would seem as louche as a pre-brunch martini. Not being David Niven, I’m making the book wait until at least after lunch. J.K. Rowling’s new book, under her pen name of Robert Galbraith, comes in at around 900 pages. I expect to rip through it smartly.

I am not an ideal reader of detective fiction, nor the thrillers and mysteries that have a whodunit at the core of their tightly planned plots. My ability to figure out the murderer – even my interest in trying – is vestigial. Finishing the penultimate Harry Potter book I remember trying to figure out what was coming next, but so half-hearted was my attempt that I have no memory of my guesses, only complete con

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