The Cuckoo song is a strange tale of fantastical beings, strange occurrences, buried secrets and ultimately, family relationships of all shapes and sizes. Triss wakes up after nearly drowning on holiday and immediately feels out of place, the pages of her diary have been torn out and she can't quite remember things, such as where her bedroom is. Worse, her sister is screaming that she's not Triss and nothing she does can satisfy the hunger she has. 
 This is a seriously weird, creepy book. Seriously. It starts off creepily. It ends creepily. With various pieces of creepy weirdness just scattered around everywhere. This is a book where I was never quite sure what would happen next and it was always the least expected thing - dolls screaming and poking the main character with pins, giant falling scissors, the main character crying spiderweb tears. 
 Surprisingly, despite all the creepy weirdness, I actually found Triss's family the strangest, except for Penn. They expected Triss to look and act a certain way, kept her close and seemed most content when Triss was ill, so they could look after her. She has an odd relationship with both her mother and father as while they do keep her close, they're quite distant from her. Penn was the most interesting character in the story for me and watching her and Triss grow closer as siblings really made me invested in the story. 
 I did wonder how we would keep the story going as I discovered the mystery before half the book had been read and while there was still a lot more story to to read and lots of events happening, it did feel slow in places. The part of the story Triss was called by a slightly different name and it really got on my nerves for a while to be honest but I can't really explain why. It was just irritating. 
 This is a great fantasy read, albeit a really weird read, that I can definitely see on my shelves. I've never read anything like it, Frances really does have a very vivid imagination! There's subtle things on the cover that really make sense once you've read the book too, I really liked that. I will definitely be reading more of the author's books, I've already added one to my Goodreads shelf!