Australian history teacher Thea Rust arrives at an exclusive boarding school in the British countryside only to find that she is to look after the first intake of girls in its 150-year history. She is to stay with them in Silk House, a building with a long and troubled past, where the shadows hide more mysteries than she could ever imagine. In the late 1700s, Rowan Caswell leaves her village to work in the home of an English silk merchant. She is thrust into a new and dangerous world where her talent for herbs and healing soon attracts attention.
In London, Mary-Louise Stephenson lives amid the clatter of the weaving trade and dreams of becoming a silk designer, a job that is the domain of men. Arriving in the market town of Oxleigh, she brings with her a length of fabric woven with a pattern of deadly plants that will have far-reaching consequences for all who dwell in the silk house.