The Lost Voice is straight forward high fantasy with a unique setting and premise. It is about a young woman coming to her own as a goddess and the relationship she has with the mortality she's supposed to leave behind as a result of her destiny. There's a love triangle which is handled reasonably well, showing Caia struggling with what her heart wants with what, well, her heart also wants.
Much of the story is dedicated to Caia's coming of age drama as well as the confusion of her life on Earth versus her life in another land. She's a fascinating character and there is much discussion about what one's responsibility is to a world you've never visited (or remember visiting) and what it's like to give up one's existing life to fulfil one's obligations.
If I had any complaints about the story, it's something that throws you directly into the confusing new world which never really let's up. We don't get to spend enough time with Caia in her normal life to really appreciate what she's giving up. Caia is somewhat arrogant and makes rash decisions without thinking them through but the protagonists cover up for her so she doesn't learn any valuable lessons until much-much later.
If I had to pick a favorite character then I would definitely say it's Archai, who manages to serve as a bedrock for our protagonist's nervous messy energy. The fear, confusion, and loss of our heroine is well-played and bounces well off against him. She may be arrogant and foolhardly but she is in a bad situation. I also liked the use of goblins who, while kicked around in virtually every fantasy story--serve their purpose here well.
In conclusion, I give this book a stamp of "entertaining afternoon's read." It's a decent enough read with a lot of wild and imaginative ideas with characters who have complicated relationships. However, it's a bit too off-kilter for my tastes and I would have liked more easing me into the new world.