Introducing: Day X

What starts with a mysterious gun in an airport bathroom and a fake refugee identity opens the door to a nationwide network of far-right extremists inside Germany’s military and police. It’s a story about a changing national identity — and the backlash against it — raising a question that democracies across the world are waking up to: What happens when the threat is coming from within?

See all episodes of Day X at nytimes.com/dayx

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