Eliza is anxious and self-absorbed, a complete outsider at her school but self-assured and beyond popular online. I think a lot of teens and tweens will identify with her on some level. Her relationship with Wallace is sweet and complicated. Her relationship with her parents is painful to read as a parent, but with realistic misunderstandings on all sides. I couldn't transition to the sections of Monstrous Sea text, and basically skimmed those. 
 Sidenote: I had a hard time seeing the periods in the font of this book, and it sometimes threw me off. They are tiny!