What does this have to do with mermaid/mermen? I wonder because if merfolk is a big part of the plot I'd be interested in the series. 😛

There aren't any mermen in it, but mermaids are pretty important to the story.

"If you think being eaten by a carnivorous tree is something that only happens to someone else, then think again."
--Shades of Grey, by Jasper Fforde

The later chapters mentions the mermaid's father..so merman might even show up eventually. Right now it's just some mermaids.