Rossa, a 12-year-old girl, is fascinated by Thomas, an archeologist and the father she has never met.

She decides to go and stay with him, in the mountains, during one of his excavations.

In the beautiful but mysterious Flora Valley a necropolis is uncovered, where bones belonging to girls of different eras have been found.

Rossa, drawn into this search, will not only be the key to unlocking its mystery but also the next prey to the monster that both protects and threatens the mountain.