Title: Locked on
Subjects: Jack Ryan (Fictitious character), Fiction, John Clark (Fictitious character), Fiction, thrillers, general, Ryan, jack (fictitious character), fiction, Sr. Ryan, Jack (Fictitious character), nyt:combined-print-and-e-book-fiction=2012-01-01, New York Times bestseller, Fathers and sons, Presidential candidates, Political campaigns, Intelligence officers, Undercover operations, Terrorism, Prevention