Sam and Annabel are visiting Drumheller, Alberta, where the farmland Sam's mother lives on is host to a dinosaur dig. Annabel, an avid learner, is thrilled to have access to paleontologists and spends as much time as she can near the dig, much to Sam's dismay. But when they learn the dig has uncovered scientifically important bones, even Sam's interest is piqued. In fact, the whole town is talking about the dig. When Sam and Annabel learn that Humphrey Battleford, a famous collector of stolen goods, is in the area, they are on high alert to keep the ancient bones safe.