And juat about anything I said would come out as a spoiler... even if I just post my speculation. Oh, I can say it took me only 5.5 hours to read it. And it may have the record low number of sex scenes for a Merry book - I would have to go back to the first one to be sure. I can also say I enjoyed it (and wasn't completely expecting that but I have grown cynical) and was quite satisfied by the end. Unlike two books ago when I really wanted to know where the hell her editor was, because the main mystery plot had a hole so wide you couldn't just drive something large through it, it totally destroyed my enjoyment of the rest of the book.
I thought that LKH would make Merry have half-sibling twins. Likely fathers being Doyle and Frost. It was an elagant solution and a way for the deities to stick a thumb in the eye of those that were aping human marriage custom.