The Day Old Faithful Stopped--A Yellowstone National Park Mystery (National Park Mystery Series, Book 1) (National Park Mystery Seriees)

Old Faithful is a national treasure that has erupted every hour or so for more than a hundred years in Yellowstone National Park. So when the world-famous geyser goes silent, the event is international news. Parker Quinn is called in to solve the mystery. But by the time it is all said and done, the Quinn children will have solved not one mystery but two!