Threat Vector is the fourth book in the Campus books starring Jack Ryan Junior. For those unfamiliar with the series, the series takes place in the same universe as the majority of Tom Clancy's work, starring the son of his CIA-analyst-turned-President hero, Jack Ryan (Senior). Masquerading as a member of an innocuous brokerage firm, Jack Ryan (Junior) conducts assassinations of terrorists and other off-the-books missions with his cousins as well as several friends of his d...