Surgeon’s apprentice Zachary Walsh knows that his master, John Howard, prides himself on his rationality. But John cannot explain how or why Mary Toft, the wife of a local journeyman, has managed to give birth to a dead rabbit. When this singular event becomes a regular occurrence, John and Zachary realize that nothing in their experience as rural physicians has prepared them to deal with a situation like this. When King George I learns of Mary’s plight, she and her doctors are summoned to London, where Zachary experiences a world far removed from his small-town existence and is exposed to some of the darkest corners of the human soul.

Rebecca Wright has found her way out of grief and depression following a personal tragedy years ago. She spends her days working in customer support for the Internet dating site where she first met her husband. However, she has a persistent, strange sense that everything around her is somewhat off-kilter. Her husband Philip's decade-long dedication to the causality violation device (which he would greatly prefer you do not call a "time machine") has effectively stalled his career and made him a laughingstock in the physics community. But he may be closer to success than either of them knows or imagines.