“Threat Vector” is a big, high-stakes techno-thriller that pits President Jack Ryan against an expansionist China. Written with Mark Greaney, it picks up where “Locked On” ends and sets Ryan and The Campus against a war brewing in the South China Sea. To some readers the scenario feels uncomfortably close to real headlines. More than seven hundred pages long, it is aimed at readers who already follow the Ryan series.

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About the book

Threat Vector is a techno-thriller novel, written by Tom Clancy and co-written with Mark Greaney, and published on December 4, 2012. A direct sequel to Locked On (2011), President Jack Ryan and The Campus must prevent a Chinese expansionist government from enacting war in the South China Sea. The book debuted at number one on the New York Times bestseller list.

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Where the score comes from

The sources average 8.0 across 52 ratings — not yet many, so the reader vote carries 26% of the weight and the rest pulls toward the Thriller average of 7.6. That is how 7.7 comes out.