Tom Clancy Zero Hour

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 ...