The Lady's Slipper by Deborah Swift
"1660. King Charles II has returned from exile, but memories of the English Civil War still rankle. There are old scores to settle, and religious differences threaten to overturn a fragile peace. When Alice Ibbetson discovers a rare orchid, the Lady’s Slipper, growing in a wood belonging to Richard Wheeler, she is captivated by its beauty— though Wheeler, a Quaker, is determined to keep the flower where God intended it to grow. Knowing that the orchid is the last of its kind, she steals the flower, little dreaming that her seemingly simple act will set off a chain of events that will lead to murder and exile, and change her life forever…"