Chalice by Robin Mckinley is currently $1.99 in the US, book is classed suitable for teens although since it is written by McKinley probably also enjoyable for adults too
https://www.amazon.com/dp/B001650UOO
https://store.kobobooks.com/en-us/ebook/chalice-1
Beekeeper Marisol has been chosen as the new Chalice, destined to stand beside the Master and mix the ceremonial brews that hold the Willowlands together. But the relationship between Chalice and Master has always been tumultuous, and the new Master is unlike any before him.