I just read somthing that said in there last year of high school after Emma moves Cleo and Rikki befriend a new girl/mermaid named Bella. It says she brings new energy to the group. I dont know if that means she has a new power. There is also a new guy named Will, who is a professional diver. He accidentally sets off somthing at Mako island that turns the water against the girls. The girls also have to deal with Zane, who is trying to reveal Mako island's secrets after Rikki breaks up with him.