Binh Duong Province is presented as the secret-zone base of Z-99, a clandestine unit whose attacks reached into Saigon. Rather than describe the province through its landscape or civilian life, the novel gives it strategic weight as the hidden base of an insurgent network: the place from which organized violence is connected to a city living under threat.

The Secret Zone and Z-99

Z-99 was based in a secret zone in Binh Duong Province. The narrator describes the unit as collectively responsible for hundreds of grenade attacks, mine attacks, bombings, mortar attacks, and assassinations that killed a few thousand people and terrorized Saigon. The province’s importance therefore lies in the contrast between concealed base and exposed city: violence planned within a secret zone was felt far beyond it.

The unit’s signature method was a dual bomb attack, in which a second device was meant to kill people who came to help the victims of the first. This tactic made the attacks dangerous not only through their initial destruction but through the expectation that rescue itself could become a second occasion for killing. The novel connects Binh Duong Province to that pattern through Z-99’s base, without offering a detailed account of the zone’s physical terrain or boundaries.

The Watchmaker and the Bomb Network

The Watchman led cell C-7 within Z-99 and specialized in adapting wristwatches into bomb triggers. To make the device, the second and hour hands were removed, a battery wire was passed through a hole in the watch crystal, and the minute hand was set to the desired delay. When the moving hand touched the wire, the bomb detonated. This precise, ordinary-looking mechanism gives the secret-zone network a material connection to everyday objects and to timed attacks elsewhere.

The devices drew on multiple sources of explosives. Some used landmines stolen from United States supplies or bought on the black market; others used small quantities of TNT smuggled into the city. The TNT could be concealed in hollowed-out pineapples and baguettes, and even in women’s bras. These details describe how the network bridged its hidden base and urban targets, while the narrator’s account of Special Branch jokes about concealment conveys how routine familiarity with the threat had become among those investigating it.

Narrative Significance

Binh Duong Province enters the account through intelligence about Z-99 and its bomb-maker, not through a scene set in the province. Its role is thus geographic and organizational: it locates the unit’s secret-zone base while the Watchman’s methods explain how that network could produce attacks across Saigon. The distance between hidden base and visible consequences is central to the province’s narrative significance.

The location also belongs to the narrator’s conflicted position within the machinery of security. He serves as chief interrogator of the Watchman, the prisoner identified as the cell leader and specialist in watch-triggered bombs. The account’s technical specificity makes the underground threat legible, but it also sets that knowledge beside the narrator’s participation in coercive interrogation. Binh Duong Province is consequently not just a point on the map: it is the unseen origin assigned to a network of violence, approached by the narrator through the equally consequential institutions charged with uncovering it.