Margaret of Ashbury is ready to settle down; the medieval healer is looking forward to an uneventful life in the country. And, indeed, life with her true love and a brood of rambunctious children is nearly perfect--except for her husband Gregory's ever-meddling family. Finding himself deep in debt once again, Gregory's father has plotted to sell Margaret's daughter off in marriage to save his woodlands from a greedy abbot. In a panic, Margaret turns to her old friend Brother Malachi to help save her daughter by whatever means necessary. The tension within the feuding family rouses an ancient being that dwells in a spring at the center of the disputed woodland. The watery creature has its own plans, and its eye is on Margaret's infant son.