I received this book, unsolicited, a few years back. Then I received another book of the same name but with a different author name, Monsterland a few weeks ago and it reminded I had this book so I read it. Then I went to start the Okon book arrived recently, and realized it's the exact same book, but different publishers and the author changed his surname. Apparently it was picked up by a new publisher and the new revised version is the start of a new series. The original version by Cash is a stand alone, while the new one under the author name of Okon is now the first of a series. There were some minor changes including small plot changes. I read this one, the Cash version, cover to cover but mostly skimmed the Okon one. 
 The story was slow, with the first two thirds of the book mostly laying the groundwork, introducing the characters and the species, setting up the park and getting characters in place. The pace was steady but glacial and the action didn't start until about page 150. The teens were realistic, behaving impulsively, erratically and thoughtlessly. Wyatt, one of the leads, is rude to his stepfather and both rude and mean to his friend Melvin. So much so that I wasn't sure why Melvin put up with it and hung around with him. Granted Melvin could be annoying but Wyatt's behavior was uncalled for. His part in the story took an unexpected turn and his character ended up both vicious and yet just and loyal. 
 Wyatt showed a pretty clear head when events at the park got out of hand. And more, he showed some compassion for the beings at the park: 
 Really, what was so special about this place? he thought for a minute. Each of the main attractions were tragic examples of life gone wrong through sickness or disease. 
 Some of the characterization was cliched, particularly that of Victor, the man behind the park. Actually, he was a mix of surprises and cliches, but mostly he was one dimensional. I would have liked more back stories on the plague that we hear about and the various beings. Cash did do a good job making me both care about them and be leery of them. Though I'm not sure why anyone thought putting all these potentially dangerous beings under one roof, so to speak, was a good idea. And their imprisonment raises all sorts of ethical and moral questions which Cash/Okon only lightly touches on. The books are aimed at teens and they are certainly able to handle the concepts and problems raised. Perhaps future books in the series will address them. 
 "Monsterland" was an intriguing concept with intriguing beings but the characterizations were weak and the pace was glacial. With a couple of exceptions, it was not a scary story. The horror, for me, was the people being locked up but the story itself was not frightening. 
 I received a copy from the author for review.