One Wednesday morning Rebecca wakes up, walks down the stairs and sees her mother, packing. Her father is watching, sad and silent, and then Rebecca, her baby brother Lew, and her mother get in the car and leave. They drive all the way to Atlanta, to live with Gran, and Rebecca's doesn't talk to her mother the entire trip. Atlanta is...it's not awful, but Rebecca's sad and shocked and angry; and then Rebecca finds the bread box. It's just a tin box, red with roses painted on it, but when Rebecca makes a wish--a reasonable wish, a wish that can fit inside the box--whatever she asks for appears inside the box. Everything's easier, but box can't make her parents reconcile, can't deliver their family back to Baltimore, and then, suddenly, the box starts making everything much, much harder.
So, it sounds a little weird, I know. A book about parental divorce that also has a magical bread box? But it's so very well-written, and Rebecca (all of the characters, actually) is so believably imperfect, that it works beautifully.