Mattie Breen is about to begin 5th grade in her 5th school. She and her mother have moved back into her mother's childhood home with Uncle Potluck who is the "Director of Custodial Arts" at Mattie's new school. Mattie is shy and sensitive and never fits in. She has decided on this last week of summer to help her Uncle Potluck at school with the hopes that he will help ease her transition to the new school. Mattie helps him get the school ready and records her "Custodial Wisdom" in a notebook which later becomes invaluable when certain events occur in the story. Mattie is also dealing with a visiting neighbor, Quinn, who wants to be friends but Mattie is suspicious of her motives. Read this book to find out how Uncle Potluck got his nickname and hear some of his witty stories which he always ends with "Hound Dog True."