Billy and Sheena are spending yet another summer with their uncle. They decide to go hunt for a sunken ship that was with another ship but a black cloud appeared and it vanished.
As they take a sub down under their uncle suddenly vanishes from the sub and they run into a sunken ship. They see a skeleton and it comes to life. They bring the sub back up but they are nowhere near their ship.
They see an island in the distance so they hop off but Billy hits his leg. They arrive on the beach and Billy grabs a stick to help him walk. They run into some skeleton pirates and they have their uncle.
The captain says he wants his stuff back but Billy and Sheena claim they don't have his treasure and so they escape. As they are being chased they run into two guys who are photographers. They tell these guys their story and they decide to take the sub out and grab the treasure to return it to the captain to get their uncle back.
As they arrive at the ship the two guys head into the water to get the chest. Billy opens their duffel bags and find guns instead of cameras.. The guys come back and realize they have been found out. They rip off their clothes and skin and reveal they are pirates who were on the other ship and the treasure was theirs before captain been and his crew stole it from them.
They throw Billy & Sheena off the boat and try to open the treasure but the red skull on the chest bites them and they sort of explode. The sunke ship now comes from the sea with the captain on it and their uncle. he says he wants his stuff back and laughs when they offer the treasure. He says he wants his leg back which happens to be the stick Billy was using as a crutch.
The captain claims he won't give their uncle back even if they give the treasure so Billy tosses the leg and it goes right through the captain and knocks him overboard. The ship sinks and they help their uncle out.
He tells them that they need to head into the black cloud because they are currently in the land of the dead and thats why the skeletons came to life and why no one has ever found the ship. They make it through but the treasure chest is no more and all they have left as proof is the red skull from its top. As they call in for help on the radio they hear the pirates song that they heard when they first got on the island...
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Horrorland section
Billy and Sheena head downstairs of the hotel and see two girls their age. They just so happen to be our heroins from the first book in the series. They are freaking because their parents are gone.
Billy tells them that their parents are also gone but they overheard a Horror saying that they always take parents away to a different hotel. The girls tell them about the camera and the picture so Billy asks if they can see it,
They are shocked when in the picture is Billy, Sheena and the two girls and behind them is Slappy. They decide that something weird is going on but decide to head out and have fun because it's all fake anyway.
They decide to go to Quicksand Beach. They end up walking across the quicksand but quickly sink. As their shoulders reach Billy hears the chant they heard from the skeleton pirate and they black out.
They end up gonna down a slide and meet a Horror at the end. Except only Billy and Sheena arrive at the bottom of the ride and no one has seen their two new friends.
As they walk and try to find them Billy and Sheena hear Captain Ben whisper "want to see your friends again?"
They continue walking and Sheena sees a hot boy who is winning all of the odd unwinable games. Some security people come and he runs towards Sheena and gives her a key card and tells her to hide it while security catch him and searches him for the card.
They arrive back to their room and notice the card has a P on it. Everything else has been rubbed off. It dawns on them that they forgot about their new friends so they decide to call the operator but all they hear on the phone is Captain Ben's laugh and no matter what number they call they just get the laugh.
As they leave their room they run into the kid again. He also has a room on the 13th floor and says his name is Matt Daniels. He explains the card was given to him by a Horror who told him to guard it.
They head off together to go downstairs and they see a sign for the cafe and sitting inside are Britney and Molly. However they aren't moving and no matter what Billy and Sheena do they get no reaction. There is also no door to get into the room.
They see a slot for a card and try Matt's card on it. It unlocks the door so they head inside. Except the room is empty as they walk towards the window they notice it's missing and so is Sheena. Except she says she's standing beside them. She claims she has gone invisible and it ends...
