An urgent call for help from their father's friend, chemist Sam Gentle, has drawn Frank and Joe across the country to northern Arizona. The cryptic message offers no clue to the danger he's in, and... This description may be from another edition of this product.
In this book, the Hardy's father, Fenton Hardy, gets and urgent letter from an old friend, Sam, in Flagstaff, Utah. When he can't go, he asks his sons, Frank and Joe, to go for him. When they get there, Sam isn't there, but his daughter is with her new boyfreind that her father does like. In fact, they had a fight the day before. They learn that Sam works for a Chemical Plant that is making a nerve gas that is disguised has a herbicide! Then they learn that Sam went out studing Pilographs. When the brothers go looking for him, they find him dead in the cave. After an autopsey, they learn that he was murdured! Filled with twists and turns every where! You'll want to read this.
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