After Part 3

Osmund Saddler's plan depends on returning Ashley to the United States under his influence. Saddler needs Ashley alive and infected so she can return to the United States as a controlled vector for Los Iluminados's political influence. Osmund Saddler's plan depends on returning Ashley to the United States under his influence.

Saddler needs Ashley alive and infected so she can return to the United States as a controlled vector for Los Iluminados's political influence. Ashley is not only a hostage. Saddler's plan depends on her social position, which makes Las Plagas a strategy for influencing institutions at a distance. Saddler speaks the language of salvation while building a system of control, making his cult's theology inseparable from his biology.

Leon removes the parasites and destroys the cult's final base before Ashley can be used. Ada steals the recovered Plagas sample for a separate employer, leaving Leon and Ashley's rescue complete but keeping the bioweapon's wider threat unresolved. Leon removes the parasites and destroys the cult's final base before Ashley can be used.

Ada steals the recovered Plagas sample for a separate employer, leaving Leon and Ashley's rescue complete but keeping the bioweapon's wider threat unresolved. Ada's sample prevents the ending from declaring bioweapon knowledge defeated; the rescue is personal and immediate, while the political market for the parasite survives.

Ada's distance from Leon is ethical as well as personal: she sees the sample as leverage where Leon sees the human cost of leaving it in circulation.