One of those books that I could have sworn I'd read, but then couldn't find a note of it anywhere. Got into it and realised, nope, hadn't read it.
From the Blurb:
When novelist Owen Quine goes missing, his wife calls in private detective Cormoran Strike. At first, Mrs. Quine just thinks her husband has gone off by himself for a few days—as he has done before—and she wants Strike to find him and bring him home.