After the epic showdown of the H2O mermaids and the red haired mermaid Charlotte who lost her tail, Emma Gilbert decided to go on vacation before starting University and to her luck, her parents bought her an all expense paid trip to the Birthplace of Jazz, the city of New Orleans. How will she react to people mistaking her for the blonde original vampire and how will they react to finding out that this original not only has a doppelgänger but one who is a mermaid.