Sorry, reading a book should be pleasurable and I like to really look forward to picking it up again. This was not the case with this and when I picked it up and was quite, not looking forward to the experience, for me it was time to give up on it, which I really hate and rarely do. I usual finish most books.
The story was complicated and the online chats confusing for me.Maybe if I were much younger I could have understood them more, but at 72, I hate to admit, they were beyond me and not interesting either.
As other people have said, the most interesting parts was the relationship between Robin and Strike. The completely wrong reason to read the book, as this should have been the least important reason. I am sure this was not what JKR intended. JKR is a very talented and influential writer, but this was not for me this time. I must admit though, if it happens, I will definitely watch the TV series to find out the ending!