In 1965, with Cold War tensions escalating, the CIA and India’s Intelligence Bureau joined forces to spy on China’s budding nuclear program. Satellites and spy planes at the time were unreliable, so the agencies hatched an unusual plan: place a nuclear-powered spying device atop Nanda Devi, the tallest mountain located entirely within India. The world’s best climbers from both America and India must scale the treacherous peak while carrying the dangerous device up to over 23,000 feet.

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