First Truth is an excellent book and the beginning of a great fantasy series. However it's not something that will appeal to everyone. It's slow paced, somewhat low-key. has very little action, and is focussed entirely on just a few characters. Assuming that hasn't put you off I highly recommend you give it a look.
The book follows the journey of Alissa Meson, a farm girl who has grown up facing a great deal of prejudice due to her mixed race. One day her mother decides that Alissa must have inherited her father's magical abilities and forces her to travel to a mythical keep in order to train them. On the way she meets Strell, a travelling musician, and he decides to accompany her on her journey.
The book is slow-paced and focusses almost exclusively on a small number of characters and the interaction between them. The narration is third person limited but perspective sometimes shifts character between chapters. Normally I dislike this device but it's smoothly done here, usually shifting between characters who've just shared a scene together.
The biggest strength of this book is the characters. They're likeable and grounded enough to seem real. It's interesting to watch how they cope as they try to make the best of the situation they're in.
This was Dawn Cook's first novel and sometimes it shows. The writing is generally good but early on there is some (slightly) shaky characterization in order to force the setup of the story. Fortunately this disappears later on. There are also points where it's hard to understand exactly what has happened due to a lack of clarity in the description.
It's also worth nothing that this book's ending leads directly into the second in the series (which incidentally is even better than the first) without really tying anything up. Personally I didn't have a problem with that but those looking for a stand-alone novel might.