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Claire discovers a grim scene at the home of one of the last surviving members of the Mad Dogs Unit. Shen May warns Leon about an ominous conspiracy.
Leon, along with agents Jason and Shen May, embarks on a covert mission to infiltrate a research facility in Shanghai aboard a nuclear submarine.
Secretary Wilson threatens Claire's life, demanding that she drop her investigation. Leon and Shen May rush to the vast subterranean bioweapons lab.