A missing Chinese scientist, unexplained noises emanating from under the Arctic ice, and a possible mole in American intelligence are just some of the problems that plague President Jack Ryan. Aboard an icebreaker in the Arctic Ocean a sonar operator hears an unusual noise coming from the ocean floor. She can't isolate it and chalks the event up to an anomaly in a newly installed system. Meanwhile, operatives with the Chinese Ministry of State Security...

"In this race-to-the-finish thriller in the bestselling Tom Clancy's Op-Center series, an attempt to exfiltrate a Chinese scientist threatens to incite a full-fledged war between China and the United States. When the launch of their powerful new hypersonic missile ends in destruction, the Chinese government needs someone to blame. Was it a failure of engineering, or sabotage? The chief engineer on the project, Dr. Yang Dàyóu, is targeted as the...

When brilliant and eccentric 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 - responsible for much of China's recent technological progress, his latest project rumoured to be the biggest yet. The problem is that none of Ryan's team have any idea where Liu is....

The explosion of a Chinese freighter in Charleston Harbor is the first sign that someone is capping Chinese interests abroad. Now under the control of the Pentagon, Op-Center is unsure of its own future-but must root out the cause of the attacks before the entire world is affected.