The Whisperer in White

When the Whisperer speaks, the universe listens. Growing up, Talia had never given much thought to the gray-robed Whisperers and their powers over reality. Their business was protecting the world; hers was hunting in the forest around her village and trying to stay out of trouble. Unfortunately for Tal, one Whisperer in particular becomes her business when she accidentally injures his companion, a talking cat-shaped creature named Morel. As punishment, she becomes the Whisperer's prisoner, whisked away to his island home for a year and a day of servitude.
There is much to do - for both the Whisperer and for Tal - as he prepares for the ritual that must be completed every hundred years to ensure the safety of the world. Tal does as she is told; her priority is to simply finish out her sentence and return home to her family. Yet there are many secrets on the island, many oddities, and they tug at Tal like an itch. As the year goes on, she learns more of the Whisperer, his duties, and the horrifying evils that he and the other Whisperers keep at bay.
But secrets still remain: a room that is always locked, a stone monument in the woods, crimson flowers whose very name causes the Whisperer to storm away. Unbeknownst to Tal, something is watching her, and what she does now may alter the fate of the world.