R.L. Stine 
Escape from HorrorLand [EPUB ebook] 

In this spinoff to the New York Times-bestselling Goosebumps series, a brother and sister go to a theme park on a rescue mission and become trapped there.When siblings Lizzie and Luke discover a bunch of kids are trapped in Horrorland, they head to the scary amusement park to help. But none of the kids trust Lizzie and Luke and soon everyone is traveling through a Hall of Mirrors, hoping to escape to a different park. But once inside Panic Park, are they really safe? Why are there no exits? What’s in the Tunnel of Hate? Have they been tricked again?