The Legend of Skull Cliff

When a camper disappears from the dangerous lookout at Skull Cliff, the cousins wonder if it is the old town curse at work. Then the police discover a ransom note, and everyone is in search of a kidnaper. But Jeff, David, and Claire can't make the clues fit. Was the bossy boy from the city kidnapped, or did something even spookier take place on Skull Cliff?