Atlantia

There is a Above world and a Below world. Rio and her sister, Bay, live in the below world with their mother. Suddenly their mother dies and Bay decides to go to the Above world. Rio is not allowed to go with. Rio is left alone with her aunt. Rio doesn't know her aunt very well because she is a siren. A siren is a blessing from the Above. Rio must find a way to get out of Atlantia and go to the Above with the help of her aunt.