Eräänä päivänä tyhjä taivas by Tiina Raevaara: This is the writer's debut novel. She has done quite well in short story competitions before but I haven't read any of her earlier works so I can't make comparisons to them.
The book is a mix of sci-fi, fantasy, fairy tale and drama. It's written quite well but like many new (and not so new) novelists Tiina feels compelled to educate her readers - sadly the lesson is one we've heard already ad nauseam (war is bad, greed is bad, the enemy isn't really different from you and add to that a decent dose of feminism and you get this book).
The book would work better without any references to things beyond its primary settings, a house in where the heroine's family lives and to where she returns after long absence. The house is used as a blatantly obvious metaphor and the depictions of the world outside offer nothing so I'd rather had seen those pages used to deepen the metaphors.
Still it's not a bad book by any means. 2.5/5 might be a fair rating.
P.S. To my knowledge the book hasn't been translated and it's Finnish name means "On One Day an Empty Sky" (not sure if that is good English but that's pretty much a direct translation).