Cast

With a nuclear arms race set to escalate the Cold War, Prime Minister Menzies appoints Colonel Charles Spry to take charge of the fledgling Australian Security Intelligence Organisation, ASIO. The staunchly anti-communist, fifth-generation soldier recruits new officers to fight a covert war against a cunning enemy. Their primary task is to investigate Australians spying for the Soviets and infiltrate Communist Party branches with undercover agents.