I don't use Goodreads often but I wanted to write a review just because of how much I loved this book. I was a fan of Mermicide, the first book in the Illyria series, when it was released, and I was nervous that Merderous wouldn't live up to expectations because sequels rarely do. I was so wrong! I enjoyed every second of this novel, I really couldn't put it down. I got the colour illustrated edition to match my copy of Mermicide and the illustrations are great. Daria's watercolour themed artwork adds to the reading experience, and I recommend getting the big version if you can afford it because it looks beautiful on a bookshelf.
The toxic relationship between Piper and Astrid comes to a crescendo in this book as Astrid realises her manipulations are becoming less effective. It feels like while everybody else is growing and developing as a person (especially Carmen, who wants to redeem herself like Falke, as if to finish what he began) Astrid is only going backwards, becoming more possessive and addicting. Piper starts to recognise her behaviour isn't good and begins questioning their relationship and the foundations it's built on. It feels realistic, like the kind of relationship you would tell a close friend to run away from and not look back. The kind of relationship that is far too often romanticised in fiction or avoided so as to not seem problematic. The author handles these difficult relationships and other heavy topics well, making sure it is never portrayed as good.
There are some especially moving scenes in Merderous, such as when Esther returns to the house of Falke to sit and remember him before returning to her new family. I found it really touching, and the way it's written is so beautiful. Mina Rose's prose as always is excellent and you can really visualise everything, especially the descriptive scenes of the water and Illyria's surroundings.
If you like Mermicide, you will LOVE Merderous. I can't wait for the next book.