When Amanda Sault and her four classmates are caught in a major food fight at school, they are given the choice of suspension or yard duty. It was a no-brainer. A two-week crash course in landscaping leads the kids to discover a weathered stone arch buried in an overgrown backyard. Instead of a forgotten lawn ornament, it turns out to be an ancient time portal from the lost continent of Atlantis. Chosen by an Atlantean Magus to be Timekeepers—legendary time travelers sworn to keep history safe from an evil force—the five children, along with two offbeat adults, are sent on the adventure of their lives to save the Earth from an uncertain future. The Timekeepers’ first mission lands them in England in 1214, where they must find an adolescent Robin Hood and his band of merry teens before history is turned upside-down.