A middle grade time travelArianna's family are proud new owners of a souvenir shop on Mackinac Island - the perfect place to make money for her paraplegic brother's surgery. No motor vehicles are allowed on the island, but there are plenty of horses easily avoided, making the island safe enough for Luc to have mobile freedom in his wheelchair all summer long.When Arianna and Luc accidentally discover that a powder horn that's been in their family...