From the cover: "Mystery and adventure flow from the pen of Bernard Palmer in this story which introduces the Bradley family. Probably best know for his Danny Orlis series..." Written in 1975. I only read the first chapter and it appears to be in that time period. The Bradley family is living in the Detroit area; they moved there only 2 years previously because of the dad's job. And now he has another job offer in Nebraska and the kids are upset at the idea of moving.

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