Life in Whistle by the Sea is calm and predictable. The children share food, tell stories, and believe their island is the whole world.

Until one afternoon, the children’s beloved rabbit vanishes down a strange hole in the woods.

Deep beneath the island lies a hidden world of living Coins: curious, mysterious beings who seem to know far more than they should. The Coins need help, and they believe the children are the only ones who can give it. In return, they promise something extraordinary… something that could change life on the island forever.

Helping the Coins means leaving behind everything the children know and travelling beyond the edges of their familiar world. Together, they must decide whether curiosity is worth the risk, and whether adventure belongs only in stories, or in the choices they make side by side.