I really liked, 'The Cuckoo's Calling' even though I'd expected not to, so I was looking forward to, 'The Silkworm.'
I felt cheated by it, to be honest. The ending felt like a cartoonish cliche of the, 'Cue: evil cackling,' kind, and the writing was pretty shoddy in places. It needed some serious editing and a visit from the Punctuation Police. She really, really needs to learn how to use semi-colons, and to not rely on peppering her sentences with adjectives to pad them out. She writes a lot of sentences along the lines of, "He walked up to the big, brown, wooden, rectangular door and knocked on the old, gleaming brass knocker," etc.
On top of all that, the characters (other than Strike and Robin) were little more than cardboard cutouts, and the whole Robin/Matthew thing is so boring and repetitive. Such a shame - Strike is great but without better editorial involvement, she's going to be selling him (and herself) short imvho.