Laurel Windflower is a witch from a family of magic workers - but her own life is going nowhere. Living in the damp, sunless side of Aro Valley, she works in a café, unable to produce anything more powerful than the most basic herbal potions. Until, one winter morning, Marigold Nightfield knocks on her door. Marigold is a scientist, but she knows plenty about magic. There are strange things happening in her house, and her future discoveries require careful negotiation with monsters. Laurel can't walk away from a mystery – and she can't walk away from Marigold either. But what lies ahead could reveal all of her shortcomings to the woman she's trying to impress... or uncover the true nature of her power.