SC Cilandak ( Gold / Fluent ) Lost Island was off limits until now. Jeff and David are going to the deserted island to search for clues and hidden treasure. Town legend tells of a robber and a secret cave, but the brothers have to piece the truth together. With the help of their cousin, Claire, they'll get to the bottom of the mystery, no matter what they have to dig up!
The cousins discover a mysterious stranger sneaking into the local dump. When bikes, toasters, and other items disappear all over town, they begin to suspect he might be up to no good. But when these items show up again, fixed and freshly painted, Jeff, David and Claire are confused. What kind of thief repairs and returns his stolen goods?
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?