When brilliant scientist Liu Wangshu disappears from his apartment in China, the Ministry of State Security is furious, and certain they know what's happened: a defection to the Americans. President Jack Ryan knows how valuable an asset Liu would be. But none of Ryan's team have any idea where Liu is. And they discover that China has already placed a mole to infiltrate US intelligence. The latest entry in Tom Clancy's #1 New York Times bestselling series.