Pre-order the pulse-racing new Jack Ryan, Jr. thriller, TOM CLANCY LINE OF DEMARCATION, now!
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Jack Ryan, Jr. is the one man who can stop a deadly war. But the price may be too high to pay.

When the leader of North Korea is catastrophically injured, his incapacitation inadvertently triggers a "dead-man's switch," activating an army of sleeper agents in South Korea and precipitating a struggle for succession.

Jack Ryan, Jr. is in Seoul to interview a potential addition to the Campus. But his benign trip takes a deadly turn when a wave of violence perpetrated by North Korean operatives grips South Korea's capital. A mysterious voice from North Korea offers Jack a way to stop the peninsula's rush to war, but her price may be more than he can afford to pay.
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Reader reviews for ZERO HOUR

'Everything we have come to live in this series: great action, set pieces and locations' ⭐ ⭐ ⭐ ⭐ ⭐

'One of the best books of the series' ⭐ ⭐ ⭐ ⭐ ⭐

'Non-stop action' ⭐ ⭐ ⭐ ⭐ ⭐

'I can't get enough of Tom Clancy, since I picked up his first book I have been hooked' ⭐ ⭐ ⭐ ⭐ ⭐

'Excellent and very entertaining, with a topical twist' ⭐ ⭐ ⭐ ⭐ ⭐