Ysabelle was the daughter of Lady Ninnia and Lord Cyllinus and the princess of the Hazel Realm. During the celebration of Aldertide, Ysabelle is eager to join the festivities, much to the dismay of her fieldmouse nursemaid Griselda. Soon however, a group of bats who are pursuing a falcon bring an end to the day's happiness. The bats manage to kill the falcon and, to Ysabelle's horror, its body falls near her and a silver acorn pendant drops into her palm.