Ace Double D-150 Paperback Original (1956). Cover Art by Robert E. Schulz
From the Introduction on the first page:
Security Agent Cussick was an old hand at outwitting possible enemies of the Twenty-first Century government. But in the bespectacled young man named Jones he met his match.
Because Jones could call Cussick’s every move – and call it in advance! For that matter Jones knew everything in advance – except the nature of the cosmic visitors who drifted down from outer space.
And yet it was around these aliens that Jones built up his drive to absolute power – a drive which was universal in scope and which no one could stop.
Because Jones knew all the answers a year ahead of time. That is, all the answers but one.