I kind of enjoy the first book of the trilogy. Its quite fast, I love the creative dimensional worlds description in this book and that reminds me a lot of the 1995-2000 Sliders television series that I used to love and of course, the 'taking-over' versions of ourselves in the universe that do feels like Quantum Leap (I am feeling a little old on this but hey, I love TV!) and voila - you have an 18-year old girl named Marguerite Caine travel through alternate dimensions that hunt down her father's killer named Paul Markov (a Russian physics favorite student of her fathers) together with Theo Beck (another physics student) on jumping through worlds. But what it seems to be on a hunt to bring justice to her father's killer may turn out bigger than what it seems into a conspiracy of a bigger league. That's how it sets off with the first book of the Firebirdtrilogy.
Its quite a simple read actually. Easy to follow, not much of science techno-explanation that might give you problems that you need to go back to your school days when you learn about science as a subject. Every thing was laid out pretty well and I do enjoy the actions that go along with it. Some how, it does lay thick with the romance when Marguerite was in Russia but every thing else is enjoyable. I can see why Claudia Gray succeed with this but I felt this first book was short on many things - unexplained loopholes, unexplained events that occurred and of course, the ending. Overall - I do find it an easy read and it can be done in a day (took me 4 because I got work to do). I do hope my next read will fill in the blanks but for anyone that loves science fiction in a simplify manner, this book might work for you (or if you love alternate dimensions that you are curious about what version are you in another dimension).