The Voiceless Ones — John Creasey

Dr. Palfrey is faced with one of the most difficult problems and a more powerful adversary than he has previously met. A mysterious disease strikes down some of the world's most powerful figures; then their daughters also become victims. Palfrey and Z5 undertake a perilous journey to oust the cause and the truth and to prevent domination of the planet by an irresponsible power and fearful new weapons.