The Bone Labyrinth

Like all the books in this series, I liked the big ideas, connecting various
mythological things together to create an interesting puzzle.
But...
There is a long talky bit about all kinds of different ways you can take various numbers, do a varietyof arithmetic operations on them and get the number 37.And we are supposed to be deeply awed by this.It's a bit like being impressed to discover that while everybody knows 6+2 = 8, did you know 4 + 4 = 8!There are two parallel adventures going on here and while both are interesting, I missed how they were connected except that both involved some evil Chinese people.And once again, our heroes make a discovery of a civilization changing repository of historical artifacts and then blow it up ( I think this happened 3 times in this book).This time, it was caused by one of the characters picking up a marble which starts the self destruct mechanismand instead of putting it safely in his pocket, he promptly drops it and loses it.
I enjoy these books and will continue reading them, but I have to take a break after reading one or two.