Third graders Nixie Ness and Grace Kenny have been best friends since they were two-years-old. They have always spent every afternoon after school at Nixie’s house until Nixie’s mom announces that she has a job, which means she won’t be there to watch the girls after school, which means Nixie will have to go to the after-school program and Grace will be spending her afternoons at their classmate, Elyse’s, house.