Following an end-of-term school ceremony, the American boy Bobby decides to go with his friend Akkun into the mountains outside their village, to a place perfect for a secret base.
On the way they stop into a mysterious amusement park.
They have fun there, but are attacked and cannot leave.
Falling in with some other children who are also lost there, they fend off a number of attacks, and gradually learn the truth behind the facility.
