Although good mermaid books are few and far between they do appear in most every genre; romance, children, folklore, science fiction, etc. Of course most of the preteen books tend to be a retelling of Andersen's Little Mermaid. There are some notable exceptions like the Emily Windsnap series, which is surprisingly good. Then there are the books that seem like they're gonna be good and end up faking you out. You pick it up because there's a mermaid on the cover and then she's not even in it. Anyway, here's a nice sampling of book covers.