The two major themes are special friendships between characters and maturation or coming of age. In addition are found themes of ethical behavior and caring for others.

Willadene and Halwice embody the theme of true friendship that crosses the barrier of age but is based on trust and mutual respect for each other. Halwice replaces Willadene's dead mother, giving her the training she needs to develop her talented nose. In a pre-industrial society, herb lore is the only medicine. Then as now, the person who is able to cure ills and repair wounds has the respect of all classes. Halwice is called to treat ills and wounds at the castle. For others, she acts as the pharmacist, dispensing the doctors' prescriptions. She has confidence in Willadene, leaving her in charge of the shop when it is necessary for Halwice to be at the castle...