Here's the summary from Goodreads: Gwen’s life has been a rollercoaster since she discovered she was the Ruby, the final member of the secret time-traveling Circle of Twelve. In between searching through history for the other time-travelers and asking for a bit of their blood (gross!), she’s been trying to figure out what all the mysteries and prophecies surrounding the Circle really mean. At least Gwen has plenty of help. Her best friend Lesley follows every lead diligently on the Internet. James the ghost teaches Gwen how to fit in at an eighteenth century party. And Xemerius, the gargoyle demon who has been following Gwen since he caught her kissing Gideon in a church, offers advice on everything. Oh, yes. And of course there is Gideon, the Diamond. One minute he’s very warm indeed; the next he’s freezing cold. Gwen’s not sure what’s going on there, but she’s pretty much destined to find out.
What I Liked: 1) Gwen. Once again, I found myself really enjoying Gwen as an MC. She's funny, and even though she's been handed this huge responsibility, the things that I like about her don't change. She is remarkably grounded for someone who can suddenly time travel. She's a very normal teen girl other than that fact, and it makes her a very likeable main character. 2) The questions. I love how many questions there are surrounding this story. I couldn't quite tell who to trust, or who was on the right side. It really gave me a lot to think about as I was reading along, and because Gwen was such a likeable MC, she's the only one I really trusted, and her questions were the same as mine. 3) Historical detail. I liked how much attention was paid to the historical detail. It's obvious in the details how much research was put into the periods that Gwen and Gideon visit. But at the same time, you don't get too bogged down with the details that the action isn't moving forward. That line between the two was met with great accuracy. It was awesome. 4) Supporting characters. There were some great supporting characters in Sapphire Blue. Some of them played a role in Ruby Red, but unlike the first book, in Sapphire Blue we know enough about Gwen and what is going on with her that we get more information about the supporting characters. Lesley, as Gwen's best friend takes to the idea of time travel remarkably well. While it was a little suspicious how well she accepted it, she offers a great amount of support to Gwen. James, her ghostly friend who attempts to teach her to fit into her time period. Both he and Xemerius (what a mouthful) add a lot of humor to the story. I think their humor was what was missing from the first book. Just when things are starting to get too serious, one of them shows up to lighten things up.
What I Didn't Like: No complaints here!
Overall Thoughts: A great second book that did not fall into that "second book trap" at all. The pacing picked up a little bit, the book continued to have it's great historical detail, and the character development was wonderful. I loved the humor that the supporting characters brought to the story, and can't wait until book three, Emerald Green is released in the US!
My Rating: 5 shots