Cave of Immortality - Philip S Davies - Bog

What price for eternal youth?
¿Seventeen-year-old Roza doesn't know she has a secret power.
When an ancient warlock kidnaps her because he needs her for a potion he is brewing, he discovers her unique and powerful gift.
But revealing her ability would plunge the whole Sapien Empire into civil war to possess and control it.
Roza's valley is threatened with destruction, and if her power is the only way to save it, how can she keep it secret?