Posing as a privileged man working for his wealthy industrialist uncle, Commander of the Saigon Rangers Tư Chung prepares with his comrades for a secret meeting with a coming Vietcong officer, alias "K9". The first part of a series based on a real-life organization involved in intelligence activities in South Vietnam before 1975.

To keep up with his public guise, Tư Chung considers marriage with his "girlfriend" and tries to flatter some trust out of the CIA advisors who've been eyeing the pair, all the while following new orders to plan and launch an important offensive. The second part of a series based on a real-life organization involved in intelligence activities in South Vietnam before 1975.

After the dangerous offensive launched on the embassy office in Saigon, Tư Chung and his comrades have to find ways to adapt to rising suspicions from the CIA advisors, as well as dealing with violent repercussions involving someone very dear to him. The third part of a series based on a real-life organization involved in intelligence activities in South Vietnam before 1975.

The year 1968 approaches. Bubbling underneath festive spirits are quiet anticipations of a major escalation of conflict, alongside exciting dreams of a brighter future...that seems so close and yet somehow far away. Tư Chung, tasked with overseeing the joint offensive on supreme headquarters in Saigon at the first moment of the lunar year, prepares himself for the most beautiful and painful of hopes. The final part of a series based on a real-life organization involved in intelligence activities in South Vietnam before 1975.