Finished A Hawk in Silver by Mary Gentle.
Teenager Holly finds a weird coin on the ground, in front of a normal shop in her normal hometown... then she meets a strange young man, and all of a sudden, the animals around her seem very interested in her... and suddenly she and her best friend find themselves drawn into an ancient war between two tribes of exiled fairies, the hill-dwelling elukoi, and the sea-dwelling morkani. The fate of all will be decided on Midwinter, when there will be either war, or a return to Faerie.
This book was published when Mary Gentle was only 21, and it shows a bit. It's a slim thing, a bit less than 200 pages, and still far away from the sometimes excessive descriptive style of her later works. It reads a bit more like a long summary of a fantasy epic than a novel in itself.
It's pretty good though. It picks up the characters of its teenage protagonists quite well, with all their likes, worries and fears (mainly a clique of sadistic bullies at school). In contrast to many other characters, (I think I've written about them, who, even with overwhelming evidence to the contrary, still refuse to believe in the supernatural), the girls here go along with everything very quickly, although they do some serious thinking about the things they got themselves into.
The faerie society is very detailed for such a short work, but their characters stay a bit stereotypical: the magician foster-father, the female magician, the harper...but well-done tropes are still better than unimaginative originals.
All in all, it's a nice, fast-paced little story, with a lot of worldbuilding stuffed into quite a small number of pages, with a pretty good ending
7.5/10.