As part of a small Australian military group three sisters of immigrant parents participate in secret missions to counteract People's Republic of China coercion and planned terrorist attacks in the Indo-Pacific. The sisters enjoyed a happy but meagre childhood in a remote West Australian township from where they emerged as the fortuitous beneficiaries of a private school education in South Australia. They displayed exceptional talents in standard and elective subjects. As young adults they excelled in tertiary education and gained degrees in linguistics, admiralty and Pacific constitutional law, pure mathematics, and computer science before coming to the attention of Australian intelligence agencies and the military. They were recruited by the military group for clandestine assignments that ranged from the outer boundaries of the South China Sea to Papua New Guinea and in between. The main parts of the story are about these assignments.