Forestfall: A Life with Chronic Illness - Lessons from a Body in Revolt: 2 (World at the Lake's Edge Duology, 2) by Clipstone, Lyndall | Hardcover | Young Adult Fiction

At the lake's edge, I made my promise. In the forest, I will fall.
The curse that haunted Lakesedge Estate has been broken, but at great cost. Violeta Graceling has sacrificed herself to end the Corruption.
To escape death, Leta makes a desperate bargain with the Lord Under, one that sees her living at his side in the land of the dead. And though he claims to have given her all he promised, Leta knows this world of souls and mists hides many secrets.
When she discovers she is still bound to Rowan, Leta goes to drastic lengths to reforge their connection. But her search for answers, and a path back home, will see her drawn into even more dangerous bargains, and struggling to resist the allure of a new, dark, power in Forestfall by Lyndall Clipstone.