For decades while the U. S. was preoccupied with Soviet spies, China quietly penetrated the highest levels of our government. In fact, emerging evidence suggests China has been America’s biggest spy threat all along. Unknown to most Americans, China has discovered the details of our most advanced nuclear warhead and aerospace secrets. Their intelligence has penetrated the FBI, CIA, and the State Department. And cyber attacks by Chinese hackers on U. S. military and defense industry computers are on the rise. A look behind America’s secret spy war with China — and what we must do to win it.