Jupiter Jones, Pete Crenshaw, and Bob Andrews are helping Allie Jamieson's uncle Harry with his Christmas tree farm, but there's something strange about their neighbor Wesley Thurgood and the abandoned silver mine on his property. When Allie finds the remains of a former gang member in the mine, the Three Investigators and Allie begin unfolding a five-year-old mystery, but this time, they might be in for more than they bargained for. Why is Wesley using dynamite in an abandoned mine? Who was lurking in Uncle Harry's barn? Does their neighbor, Mrs. Macomber, know more than she tells? Join the Three Investigators as they uncover the mystery surrounding Death Trap Mine.