Scholastica, or "Tick," has grown up helping her father make candles in his shop. The experience has its ups and downs--while constantly smelling like tallow makes it hard for Tick to keep friends, stray cats love her. Still, she delights in the work and the fact that she can help Papa. Every summer, they use the long daylight hours to make as many candles as possible to sell at the Stourbridge Fair, the highlight of their year. And this year Tick is finally going to be allowed to make the special Agnus Dei charms that keep travelers safe.

Because she's a girl, Tick can never be a true apprentice in the trade, but if she gets to do the job anyway, does it matter what she's called? But one morning she finds a boy sitting at her workbench. Papa has taken on an apprentice and now Tick is forbidden from helping with the candle-making.

Tick isn't about to stand for this unfairness. She's going prove to Papa that she deserves to be his apprentice, even if it means sneaking away to the Fair...