Mark is intrigued with the shrunken head his aunt sends him from the jungle island of Baladora, and his fascination only increases when he wakes one night to see the head glowing with a strange power.

"Ray Gordon loves to scare his younger brother, Brandon. It's not hard considering Brandon is terrified of everything--loud noises, roller coasters, and especially the wooden dummy, Slappy, that Ray got from Jonathan Chiller's HorrorLand gift shop. In order to throw his big New Year's Eve party, Ray's parents make him promise to leave Brandon alone. But strange, mean-spirited things keep happening to his little brother, and Slappy always seems to...

Boone and Heather are going to summer camp, with man-eating snakes and disappearing campers. Things get worse when Boone joins eleven other guests at Horrorland because something's wrong with the bumper-car ride called the R.I.P.P.E.R.

"For an athlete like Matt Daniels, breakfast is the most important meal of the day. It's also the most dangerous. That's because somebody is about to pull a mean prank. The recipe is simple: just add monster blood."--Cover, p.4.

What should Carly Beth be for Halloween this year? Terrified! Late at night, and ugly green mask is mysteriously calling out to her. If Carly Beth survives the night, even a scary theme park might sound like a vacation. Or maybe not! At Horrorland, every night is Halloween. And those monster masks? They aren't masks at all.

Julie begins to suspect that HorrorLand is not all fun after she is attacked by a giant spider.

When Andy and his cousin Marnie visit HorrorLand and Andy takes home a tooth that can grant wishes and came from a dog with evil powers, at first they are thrilled about the wishes, but then things start going wrong.

The children trapped in HorrorLand have found a way to escape from the horrific amusement park into Panic Park, and they turn against Luke and Lizzy Morris when they warn them that they may actually be safer in HorrorLand.

Luke, Lizzy, and the other children have escaped HorrorLand, but to get out of Panic Park, where they are now trapped, they must join forces with an old enemy to defeat a villain named The Menace and overcome a friend's treachery.