I loved the setting of this book - at a fancy party in a ballroom in ever stranger worlds. The world building was very inventive with the various Echos, the more or less evil supernatural beings, the guilds and the quirky teashop. Perhaps, the author could have gone into more depth here and there. The main story is a sort of detective mystery with a dash of romance. I appreciated how the main character is a new mother and how that's handled. There are a few minor things that keep it from being 5 stars but I found it a thoroughly entertaining read.