Australia is a vast land surrounded by water. To the south, east and west are large oceans. To the north, only a short distance away, is a country with a population ten times greater. Jock Macdonald, a retired SAS major, decides to visit his friend who owns a working cattle property in North Queensland to help him forget the recent loss of his family in England. He becomes involved in the running of the property and the people who live and work there. Following the suspicious death of an Aboriginal stockman and the arrival of Sandra Duncan a freelance journalist the story unfolds and they all become embroiled in Government intrigue, sabotage and saving Australia from invasion.