Unveiled as the first lightwender in living memory, Sirscha is summoned to the domain of the Spider King. For centuries, he has used his influence over the Dead Wood, an ancient forest possessed by souls, to enforce peace between the kingdoms. Now, with the trees growing wild and untamed, only a lightwender can restrain them. As war looms, Sirscha must master her newly awakened abilities before the trees shatter the brittle peace, or worse, claim Saengo, the friend she would die for.