I felt like this story was going nowhere for the entire first half. Then they get to the Prometheans' secret cavern and almost every element of the place seemed to come from Indiana Jones or Tomb Raider or some other action/adventure film: a giant orrery, an indoor pyramid, a secret underwater entrance, the flame channels in the walls, etc. I don't know how to feel about this book except bored. It felt like a lazy effort. And the reason for all those crazy obstacles didn't make sense to me. I thought the alchemists tomb was originally a place for the Prometheans to hang out in addition to hiding secrets. How did the Prometheans themselves get in safely every time?