3-4 stars.

Honestly: If I didn't know that this is JK Rowlings book, I would have never made it until the end. Or even the middle part. The story is quite good, but all in all it was boring. Too many interviews and dialogues and way too less action. Strike has a cool name but his character is a little bit flat, in my opinion.
Nevertheless, the last quarter was better. It catched me - a little. The end was not surprising, I already had this suspicion ;)

It's an ok book but definitely not a 5-star-page-turner.