Vikings and a supposed curse around a runestone are all things I would normally gravitate toward, but somehow they weren't very interesting in this story.
First, historically, I knew it had to be a hoax (or else MacLeod would be very off in her history) so there wasn't much mystery there.
Second, the murderer gives a blatant clue early on in the book about a motorbike accident.
Next, we have a character/suspect with the obnoxious nickname Nutie the Cutie that everyone uses only because the author enjoyed it so much. No real adults would constantly refer to this slick, arrogant person by such a name.
Speaking of characters, it's very difficult keeping track of who's related to who. There are far too many family connections. At a certain point, I stopped trying or caring.
Also, we have the sudden addition of our lead, Peter Shandy, suddenly gaining this recurring quirk where he says, "M'yes" all the time.
Finally, it's weird that a book with so much implied sex should also be so morally righteous suggesting and insisting that anyone who hooks up, even two centenarians, must get married. We're told that 105-year-old Hilda is going to move to Sweden. The trip alone would kill her. Even in this imagined world of MacLeod's, we still have to be realistic about the reality that any time two people meet, they don't have to get married.
I'm tempted to drop this to two stars, but I realize my reaction is because it's such a drop in quality from the previous two. It's not a bad book, just disappointing.