When Daniel Roberts is invited to the funfair by the prettiest and most popular girl in school, he can't believe his luck. Billy, Dan's best mate, on the other hand, is not convinced that Madison Page's intentions are as innocent as they first appear to be.

The funfair has come to Castleton For One Night Only and the rides and side stalls are full of excited people. Although usually shy around girls, and never really a popular member of the school, Dan suddenly feels confident, extrovert even, with Madison on his arm. He is sure that it's going to be a night he will never forget.

And he's right.

Before long Dan's dreams are shattered and his world is turned upside down. Not only has he been tricked and made to look a fool by Madison and her friends, but the fairground holds a terrible, hideous secret. A secret that places the population of Castleton in mortal danger.

As the increasingly horrible events of the night unfold, Dan and Billy have to fight hard to survive the mayhem and slaughter that is happening all around them, while trying to find a way to escape the nightmare they are caught up in.

It's a fight neither of them are confident of winning, especially when the truth of what is taking place at the travelling funfair becomes apparent.