When a girl's face appears, then disappears, outside a window of their spooky old schoolhouse, the cousins think they've seen a ghost. More strange clues-piano music lilting through empty halls, a secret passageway, and an old portrait that looks like the girl from the window-make Jeff, David, and Claire begin to wonder: Is their school just spooky, or could it be...haunted?
When a camper disappear 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 kidnapper. 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?