So, this book deals quite bluntly with themes of suicide and depression. If these are issues you have difficulty with please be careful when reading this book. It's wonderful but very intense at points. Oh, this book. Would you believe I almost didn't finish it? I'm so glad that I did. Here's what's happening in this book. Coral is a young mermaid whose culture considers emotions a disease. Her older sister fell in love with a human and is now waiting to die of the horrific Red Tide Brooke is staying at an inpatient care facility for her depression and is struggling over painful memories. Merrick is struggling with his domineering father, his depressed kid sister, and his mother leaving.