The Evolution Solution

Fengari and her brother, Ilios, are members of an ancient family. They are in a world of ancient beasts and magical people. But, their family is cursed. The only way to save themselves and their family forever is to find the cure. It's a shot in the dark, but it's worth it. Their world has no modern technology, and they have bows, swords, and their own mind as weapons. Will they even be able to pick up where their father left off to save themselves, and their family from a terrible fate?