Review: Cuckoo Song by Frances Harbinge

Cuckoo Song - Frances Hardinge
Thanks to publishers Pan Macmillan for the ARC received via netgalley in return for an honest review. Published on 8th May 2014.
This is a tale of two sisters, Triss and Pen, and a strange place found in the underbelly of their own existence. Sounds peculiar doesn't it?  I really wanted to like this book. The title and front cover grabbed my attention, and the unusual premise sounded fascinating, but, I couldn't get into the story at all. I found that it took me several days to finish this novel, a long time for me, and I even skimmed rather a lot as I grew bored with it after the first 20%.
Disappointing. 2/5 stars.