For something like two hundred and fifty years Earth had been dominated by humanoid aliens from the star world of Alishang. But man's spirit refused to be conquered. There was a world-wide underground planning for the day of final liberation. And there were four leaders who knew the secret that would guarantee victory - the secret of ZI.
Rupert Clinton, intelligence man for this underground, was not one of those four; yet somewhere deep in the recesses of his subconscious mind, he knew ZI's secret.
Kenneth Bulmer (1921 - 2005)
Henry Kenneth Bulmer was born in London in 1921. He was a prolific author, writing over 160 novels under a bewildering array of pen names, and including adventure, historical and western novels, as well as TV tie-ins in addition to his prodigious science fiction output. He died in 2005.