The Cosmic Computer (Unabridged‪)‬

"There are incredible things still undiscovered; most of the important installations were built in duplicate as a precaution against space attack. I know where all of them are.

But I could find nothing, not one single word, about any giant strategic planning computer called Merlin!"

Nevertheless the leading men of the planet didn't believe him. They couldn't - the search for Merlin had become an abiding worldwide obsession. Merlin meant everything to them: power, pleasures and profits unlimited. 

Conn had known they'd never believe him, and so he had a trick or two up his space-trained sleeve that might outwit even their fabled Cosmic Computer...if they dared accept his challenge.