October 31, 1989: a stubborn and resourceful twelve-year-old girl mysteriously disappears after venturing into a cave by the sea in search of the legendary "King Owl’s treasure", thanks to which she dreams of moving with
her family to the USA. When she reappears, thirty years later, she is still twelve... and so begins her adventurous journey between past, present and future, lost in the labyrinth of tunnels dug under the city, which will force
her to confront her identity and her roots.