Monica's discovery of a hidden family history is exquisitely braided with Yun's own memories as she writes of her years in Shanghai, working at the Phoenix Pencil Company. As WWII rages outside their door, Yun and her cousin, Meng, learn of a special power the women in their family possess: the ability to Reforge a pencil's words. But when the government uncovers their secret, they are forced into a life of espionage.