I really could not put this book down! From finding out how Polly disappeared to finding out what became of her and to seeing how the characters in the story came to find out what happened to Polly, this was a real page turner.
The story is primarily told from the perspective of Carmel, Polly's older sister, who is the one who was looking after Polly at the time of her disappearance. You really want to feel sympathy for her, especially in the early years when she was pretty much rejected by the rest of her family, and it is easy to feel sympathetic towards her. However, in part two, as Carmel has grown up and the story is also told through a couple of other characters, you manage to understand why they feel the way they do about Carmel and how some other characters manage to come across in a good light - this is not a bad thing as it makes all the main characters seem a bit more real.
It is established relatively early on (about a third of the way into the story) what happened to Polly and you know from then on that the ending will be painful, but the ending still managed to take me by surprise and there are plenty of things going on before it gets to that point.
A wonderful story which, although was a free download at the time I ordered, I would have been happy to click on the "buy" button if it had appeared on the paid for list.