After everything the little mermaids have been through, Brynn is sure that she and Jade are best friends forever. But then a new girl is transferred to their class... Priscilla is a real metropolitan thing: she is already allowed to do makeup and buy whatever she wants, she poses for fashion magazines, and her family owns a huge mansion with servants. Jade is clearly delighted with her new friend and spends so much time with her that there is no time left for her old friends... Terribly upset, Brynn does not immediately notice that something strange is starting to happen around her. Looks like the sea witch is back at it again. But he and Brynn have old scores...