Set during the events of Harry Potter and the Prisoner of Azkaban, Hogwarts gains an unexpected addition to its staff: a young healer whose bedside manner is warm, patient, and dangerously effective. Students flock to her infirmary with even the smallest excuse, and before long, many of them seem to prefer her care to that of the notoriously strict Madam Pomfrey. Professor Snape, however, is unimpressed.