2.5 stars. 
 This book started off really well - it was dark and I was hopeful and excited because I love the Labyrinth and I love dark, fae-related stories and retellings, but as I read, I just... lost interest. It was the same thing happening over and over (view spoiler)[Liesl talks about music. Liesl talks about how plain she is. Liesl argues with the Goblin King. Liesl talks about how wolfish the Goblin King is. Liesl wishes for the austere man to come back. Liesl argues with the Goblin King. Liesl can never share her music with anyone because her music is her soul. Liesl talks about how plain she is again. Did you know that Liesl loves music? Because she does!!! (hide spoiler)] and I eventually realised that very little was actually happening. They constantly mentioned the "old laws" but we never really get more information than that and the ending felt so rushed and out-of-nowhere and unsatisfying. 
 I wanted so much more from this story and it just ended up disappointing me tbh.