Jack Ryan has only just moved back into the Oval Office when he is faced with a new international threat. An aborted coup in the People's Republic of China has left President Wei Zhen Lin with no choice but to agree with the expansionist policies of General Su Ke Quiang. They have declared the South China Sea a protectorate and are planning an invasion of Taiwan. The Ryan administration is determined to thwart these Chinese ambitions, but the stakes are dangerously high as hundreds of Chinese anti-ship missiles thwart the US Navy's plans to protect the island. Meanwhile, Chinese cyber warfare experts have launched a devastating attack on American infrastructure. Jack Ryan Jr and his colleagues at the Campus may be just the wild card that his father needs to stack the deck. There's just one problem: someone knows about the off-the-books intelligence agency and may be ready to blow their cover sky high.Threat Vector follows the gripping novels Locked On and Dead or Alive as the fourth title in Tom Clancy's Jack Ryan Jr Series.