London? Time travel? Stunning cover? Of course I had to pick up Ruby Red by Kerstin Gier. Sure, I had a few small problems with this book, but I sped through it and am very eager to read the rest of the series.Ruby Red gets off to a fast-paced start as Gwen time travels right away. I was really intrigued by Gwen and the fact that she was positioned as something of an underdog. She’s not my favorite character of young adult literature, but I enjoyed reading her story.Gier does a nice job of world-building in this story. Her concept of time-travel was well thought out and interesting. I loved reading her descriptions of all of the eras that Gwen visited.What frustrated me about Ruby Red was the lack of satisfaction at the end of the story. There were a few points where I thought I knew for sure right where Gier was taking us, but I never got to find out if I was right. I’m not a blogger who has started to hate all series just because everything is part of one, but this particular instance frustrated me, because a little more resolution would have been nice.Even though Ruby Red didn't completely satisfy me, I enjoyed the quick ride I went on during Gier's novel. This is a book that goes perfectly with a rainy day and a cup of Earl Gray tea. I want to know where Gier is taking her characters, so I look forward to picking up my ARC of Sapphire Blue soon.