Deep under the sea in Pacifica, mermaids like Isla and others are preparing for the Mermaid Moon Ceremony. But trouble is brewing on the water's surface, which can only mean one thing--Barbie "Brooklyn" Roberts and Barbie "Malibu" Roberts are needed in Pacifica! Young readers will love following along as Brooklyn, Malibu, Skipper, Stacie, and Chelsea learn to harness their mermaid powers in order to save the kingdom from a misguided scientist in this exciting story that follows the Netflix special Barbie: Mermaid Power and comes with a mermaid tail necklace!