Frustrating to read -- the writing is nice, but tries a bit too hard to be "magic-by-the-sea". It starts out as the usual broken-girl-falls-for-broken-hottie story, and as the story progresses, and as I learned more about the cause of the heroine's accident/muteness, the less I liked her. She is self-pitying and self-absorbed, surrounding by all these fun, nice people who are falling all over themselves trying to be her friend. Somehow, she doesn't try to learn sign language. Somehow, she manages to get by not saying anything, mouthing words (I'm imagining bad lip reading parodies on youtube, but almost everyone worthwhile magically understands her), and eventually writing poetry on anything in reach when pushed to it. 
 Since she's so bitter and resentful about her dashed hopes and dreams, (view spoiler)[ she shuns her family and her beloved twin sister who SAVED HER LIFE, resents her sister for having a singing career when she can't, and runs off to a different country for months to make better friends with a random hot guy and his baby (and probably gay) brother. (hide spoiler)] There's a lot of mystical hoo-haa about her being dragged to near death by the siren call of the cruel, dark sea and about being a mermaid, but I can't get out of my head that all her troubles are from her own doing and mindset. Add in some really annoying you-can't-win drama with her new boyfriend's father, and I basically just skimmed the ending.