Still deserves a spot among my favourite books. It presents mermaids in such a scientific yet easily understandable way that you could easily believe they exist somewhere at the bottom of the ocean, where no human being has explored. The character POVs are alive, and even the unlikeable ones have their own motivations that make sense internally. The mermaids are fascinating and scary, and the cast is diverse. Tory is bisexual and Olivia is autistic, but my favourites are the deaf twins and their hearing interpreter sibling, who really make you think about deaf culture and communication.