At the height of the Cold War, only a master spy could be trusted to expose one of their own.

Other lines from this film

• How do you find an enemy who is hidden right before your eyes?featured
• The secret is out.
• Trust no one. Suspect everyone.
• The enemy is within.

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Lines whose meaning sits closest, by embedding similarity.

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Shape: at the … of the … … … a … … could be … to … … of their …