After the epic events of the previous book in the series (Saturnine) this was a just ok. Though the Traitor Titans have landed on Terra and are closing on the walls of the Imperial Palace, the story was not as monumental as as it should have been.
I think this is because a lot of the book seems to be building on stories of 'lesser' characters and I hope this will have a big pay off in the later books in the series. Unfortunately in this book it seemed to be more filler than driving the plot forward.
Let's hope it picks up again in the final few books of the series!