I loved this book and look forward to the next one.
I did not read the first book but did not find that to be any sort of hindrance.
It reminds me of LOTR, in that at first there is a map of this land created that our travelers must travel through. There are nasty goblins, half goblins, wolves- both magical and regular - magic eagles, fairies, half fae, or faelin, and humans.
Eiran is a powerful sword that can possess the user. It has a spirit all it's own. The twins, Diello and Cynthe are trying to return it and ransom their young sister, as long ago their mom, a fairy, and their dad, a human, stole it from the fae realm. They believe the balance of the different species of beings rely on it being kept by the Gaurdians in the land of the fae.
The action sequences are very good and at times I really feared what had happened to Diello. He is a budding sage and, as it turns out, mage. The visual descriptions in the book is great - I loved this one scene where a fae character was wearing robes made from silver fish.
It's a bit predictable and ends rather unsatisfactorily - you'll have to wait for the next book! kinda ending that I'm seeing a lot of these days, that at times makes you really think it's just a way to make more money. I say that kindly - I would not have minded this book being another 300 pages at all for a bit better resolution of the story.