October, 1944. It has been a challenging season for Elderberry's favorite first grade teacher, Miss Dimple Kilpatrick. A beloved former student was recently killed in the war, her brother has become distant, and her friend Odessa, the cook at Pheobe's rooming house, has taken a leave of absence to care for a relative. Still, when Dimple's librarian friend, Virginia, finds a young woman, Dora, on the library porch looking for a place to spend the night, soft-hearted Dimple brings her back to Phoebe's and offers her food and a warm coat. But when Dimple is trying to find her a place to sleep, the young girl disappears.
The next morning, Miss Dimple answers a knock on the door expecting it to be the girl. Instead, she is greeted by greeted by a somewhat disheveled young woman with lustrous hair and a sunrise of a smile who claims she has been assigned to fill in at the house. Augusta Goodnight, a guardian angel who has been summoned from a well-deserved rest after a series of troublesome earthly duties, has taken up at Phoebe's.
When Dora is discovered dead - murdered - the real reason for Augusta's "assignment" becomes clear, at least to Augusta. Reluctantly, Miss Dimple teams up with Augusta to find out who the killer is.