Death Beam — Robert Moss

The Soviets have taken the space laser out of Science Fiction and made it terrifying fact - an irradiation beam of incmparable power ready to be unleashed against the USA. All that stands between the world and a cataclysmic war is an extraordinary group of Western Intelligence operatives known as the Club.
Death Beam is a breathtaking race against time and disaster, a dazzling danse macabre played out in a maze of disinformation and double-cross, a novel so tense, so taut, so topical you will live with the nightmare of DEATH BEAM-day and night.