Changes: The Dresden Files, Book 12

In this gripping installment of the urban-fantasy series, professional wizard Harry Dresden faces a dire challenge when his former lover, Susan Rodriguez, reaches out for help after being ensnared by the vengeful Duchess of the Red Court. Having fought her own monstrous transformation in South America, Susan's secrets may prove pivotal in their struggle. To protect his child and confront the encroaching darkness, Harry must harness his untapped power, pushing the limits of his morality and magic.