The Mystery of the Haunted Castle

George and his friend Bill have been moved from their job in an Atomic Power Plant near Toronto, Canada, to work in a Central American country where they are installing a new atomic power plant purchased from the Canadian government.
While George is renovating his house he discovers a map that drives any local natives mad with fear when they view it. They follow a dangerous trail into the rain forest, by land and by water, to stumble onto what appears to be a deserted European style castle.
Their interest spikes when they learn that a mysterious dragon prowls the orchards and fields which appear to be tended by teams of robots.
Entering the castle what happens to them next literally sends them into space.