Liberty Hardy recommended this on the All the Books podcast by Book Riot, and I was immediately intrigued. It turned out to be a short and fun read, perfect for escapism. 
 I describe this book as a magic-in-the-real-world type of book. It's not really magical realism, because the characters are lucid in the strangeness of the occurrences. It's also not fantasy, because (view spoiler)[it never really becomes clear if it is magic or not. (hide spoiler)] It's got a sort of folklore and local legends type of feel to it, which I really enjoyed. I liked the setting of Puerto Rico, which was vividly described. I thought the protagonist was interesting-- for some reason I initially thought it was a girl, though I later figured out his name was Lucas. Though he was not really likeable, I thought his general apathy was believable in the story. 
 I zipped right through this book-- both because it was exciting, and also because it really is short and sweet. There's not a whole lot of physical action, but the little bits of plot that were unveiled kept my cogs turning and I found it hard to put it down. It's just pure fun, and another bonus is that I haven't read anything very similar to it. I would recommend this as an easy entertaining read! 
 (view spoiler)[I was a bit disappointed by the ending... I wasn't really sure what I was expecting, but I had been hoping for a bit more magic. It ended up being more emotional than magical, which is fine, 
 and in fact I think the author made the right choice for the novel to leave the magic open-ended. 
 I would have liked to receive a medical scientific explanation of this presumably autosomal recessive metabolic disease. Alternately, I would have liked a revelation of real magic on the island. I appreciated that the loose ends were tied up, and I was indeed satisfied with the conclusion. I just wish there could have been a bit more magic in there! :) (hide spoiler)]