Luna (12) and Kiki (8) move with their father to a mountain village called San Misterio after the mysterious disappearance of their grandmother, Emma. Upon arriving, the first thing that catches their attention is the lake in the valley. From the surface of the water, the tower of the old village still rises—remains of a town flooded years ago. They soon discover that their grandmother was considered a witch by many locals. In a journey of self-discovery, Luna realizes she is the heir to this legacy. She must learn to master her magical powers to solve the problems in the village, as the lake’s level drops, revealing long-hidden mysteries.