The back and forth narration doesn't work I enjoyed the change of narrator in Tangled Tides, it flowed and I got to know the characters. I am allowed to think that way. Fin's mother is a second class citizen because she used to be human. And believe me when I say there is one character that I want to punch. Fin was no better - he made the stupidest decision, whined all the time.
I like to read about mermaids but not like this. Yes, Prince Harry, motherhood is hard work. Ash is a normal, 17 year old high school senior, while Fin is a 17 year old merman.