Much to their surprise, the Peaches had a great summer running their food truck business selling their pies across the Mid-West, but they're happy to be back home in Duluth, Minnesota, where they can settle back into a routine just in time for the new school year.

That is until Great Aunt Lucinda drops a big surprise on them: She wants to gift them her historic mansion. But there are conditions: they're to turn it into a cozy and welcoming bed-and-breakfast, something the Peach kids' mom always dreamed of before she passed away. And they only have until Thanksgiving to do the renovations and prove they can make the business work. It looks like it's a new chapter of The Great Peach Experiment.

But as the Peaches roll up their sleeves, they quickly realize the house is more of a pit than a welcoming escape. And as the family juggles builders, possible hauntings, doggie obedience training, a treasure hunt, and the demands and worries of work and school, they soon realize that there are wonderful secrets hidden within the house's walls, if only they can take the time to see them.