This novel is the sequel to The Jewel. The action, suspense, and revelations all come together to make for an enthralling story that'll make you eager for the final novel.
Lucien's plans to help Violet escape were complicated when she tried to save Raven instead of herself. Things then became even further complicated when Violet is caught with Ash, the royal companion, which lead to the two of them being captured and threatened with death. When some unlikely allies show up, everyone manages to escape the confines, but face new challenges that might prevent them for obtaining their freedom. Along the way, Violet and her friends learn of a secret society known as the Black Keys, all working together to bring down the royalty and fight for those who are oppressed. Violet also learns that these Auguries which gave her power are only one form of power that she has. It is believed that she's strong enough to use her new found magic to break down the walls separating people and help them destroy the people in power. Everyone works together to build their army, but when the game starts to change, success becomes even more important to Violet than ever.
This is an excellent sequel. It starts off with wonderful amount of suspense as Violet and her friends try to escape the Jewel. You have a feeling that they'll all survive since it's only the second book in a trilogy - at least until the middle of the book - but the worry that something horrible will happen is fairly present in their escape. The novel slows down a bit when Violet learns the true nature of her power. Then it's all about getting ready for the next stage of their attack. There are a few more peaks of excitement but it's pretty steady until the last chapter when a bomb is dropped and another cliffhanger that has you salivating for the next book (not out until next year). Characters grow in this novel so that you fall in love with all of them and hope for the best.
After reading this novel I'm even more invested in seeing where things go. It's going to be awful waiting another year. I hope it will be a solid payout, but if the first two novels are any indication, it will be worth the wait.