"When Jamie and Marie Longbow find out about the mysterious ghost dog that steals food from the Powwow and no one has been able to catch, they are determined to find out what's going on. When they finally get closer to it, it runs into the spooky abandoned house—with a buffalo burger dangling from its mouth—where Old Man Jimmerson used to live. Is it really a ghost dog? Should they go in? How are they going to solve this mystery when they are terrified of what might be on the other side of the door?"—

Jamie and Marie Longbow's reputation for solving mysteries is getting around. They are at another Powwow when a man named Lester Laughing, dressed in full regalia, approach them with a treasure map and ask them to solve a mystery. Jamie and Marie follow the clues hoping to find treasure but what they find out in the end is more surprising than the treasure itself.