Viola Doyle is a teenager in Victorian England (I believe, though it's never actually stated... it's that sort of era, at any rate). She is unruly, feisty, and doesn't quite fit her mother's ideas of what a 'proper lady' should be like. Her Grandmother gives her a gift of a pin which glows lavender and chooses it's owners, and that's the beginning of a story involving dragons and guardians and professors. 
 This was a fun and easy read. It wasn't very long - in fact, it could do with being a bit longer, in my opinion - and was fast paced. Viola and Mikhail were interesting characters, but I just felt that there was a lot more to their characters, which wasn't explored because of the length of the book. Not only that, but I feel like their relationship, though cute, wasn't fully developed, because of the constraints of the length. There should've been more scenes and interaction between them, before they jumped into the 'love' stage. 
 The story itself was interesting. Anything with dragons automatically gets a tick from me, and I liked the idea of the pin and what it stood for. Again, I felt like because of the shortness of this novel, this was only really an introduction to the world and setting up for other things in the future (I hope). 
 Overall, though, I did enjoy reading this, and I would recommend it, despite the limitations that comes from it being less than 150 pages.