On Australia’s Gold Coast, summer 2026 begins like every other: beach parties, late-night swims, and endless days under the sun. But after three best friends sneak onto the mysterious Mako Island during a full moon, their lives change forever. Now forced to hide the fact they transform into mermaids whenever they touch water, Y/n Cove, Kaia Hart, and Mira Bennett must learn to control dangerous new powers while keeping their secret hidden from the world around them. But for Y/n, things are even more complicated. Because the ocean already knows her name.