It isn't easy being the rather overlooked and unhappy youngest sibling to sisters named for the other six days of the week. Sunday's only comfort is writing stories, although what she writes has a terrible tendency to come true.

When Sunday meets an enchanted frog who asks about her stories, the two become friends. Soon that friendship deepens into something magical. One night Sunday kisses her frog goodbye and leaves, not realizing that her love has transformed him back into Rumbold, the crown prince of Arilland--and a man Sunday's family despises.