 The Cult of Cambodyses, a group of killers based in the Middle East, is used by Thrush to perform murder. The cult, however, wants to break free of its alliance with Thrush. It plans to gain control of a formula that can transfer the consciousness of a long-dead person into the mind of a living descendant. It turns out Cambodyses has only one living descendant, a woman who the cult covets. U.N.C.L.E. and Thrush are also after the woman, who it turns out has a bit part in a Western movie being filmed at a Berlin film studio. April and Mark have their hands full with both the cult and with Thrush, which wants to bring the cult back under its control. Cult members are raised to be killers at birth and ingest poison from a young age. They are like "human snakes," immune to poison themselves, but they can kill simply by scratching their victims.