Whitten, Hannah. Nightshade crown #3

"Lore has failed. She couldn't save King Bastian from the rotten god speaking voices in his mind. She couldn't save her allies from being scattered across the continent-their own lesser gods whispering to them in their dreams. She couldn't save her beautiful, corrupt city from the dark power beneath the catacombs. And she couldn't save herself. Banished to the Burnt Isles, Lore must use every skill she earned on the streets of Dellaire to survive the prison colony and figure out a way to defeat the power that's captured everything and everyone she holds dear. When a surprise ally joins her on the Burnt Isles she realizes the way forward may lie on the island itself. Somehow, her friends must help her collect the far-scattered pieces of the broken Fount-the source of all the god's powers-and bring them back together on the Burnt Isles, returning all magic to its source and destroying, once and for all, the gods corrupting the land. But as Lore gets closer to her goal, her magic grows stronger... and to a woman who's always had to fight for survival, that kind of power may be hard to give up"--