Sam and Annabel are visiting Sam's mom in Drumheller, Alberta. The farm she is living on is hosting a dinosaur dig. Annabel 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 is curious. In fact, the whole town is talking about the discovery. When Sam and Annabel learn that Humphrey Battleford, a famous collector of stolen goods, is in the area, they realize they need to do their part to keep the ancient bones safe.
When Trevor, Nick and Robyn visit the Royal Tyrrell Museum, Robyn is inspired to raise funds for a dinosaur dig that will close soon if it doesn't find funding. The kids are caught up in another mystery when a chain of suspicious events, including the disappearance of important fossils and a fraudulent discovery at the dig, leads them to wonder what's going on. Is the new visiting scientist behind the fraud, or did Robyn's enthusiasm to save the dig lead her astray?