British agent and Smith's lover who works undercover inside the castle. Coordinates with Smith to facilitate the mission, helps expose the double agents, and successfully escapes with the group.
Heidi coordinates underground logistics to place Mary inside the enemy fortress.
Both operate as part of the broader infiltration network targeting the castle.
Berkeley is assigned to the same commando unit as Mary's operational network.
Christiansen operates within the same infiltration framework as Mary.
Mary's undercover role is designed to undermine Rosemeyer's interrogation efforts.
Von Hapen's suspicion encompasses Mary, making her a target.
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