"Clear and Present Danger" is a political thriller novel written by Tom Clancy, published in 1989. It's the fourth book in Clancy's Jack Ryan series, following the character Jack Ryan, who works as a CIA analyst and later becomes President of the United States in Clancy's fictional universe. In this novel, Ryan is thrust into a complex web of intrigue involving drug cartels in Colombia, covert operations, and political maneuvering within the U.S. government. The story deals with themes such as the war on drugs, governmental corruption, and the moral dilemmas faced by those in positions of power. The title "Clear and Present Danger" refers to the legal standard established by the U.S. Supreme Court to determine when restrictions on First Amendment freedoms are justified. In the context of the novel, it suggests the imminent threat posed by the drug trade and the lengths to which government agencies are willing to go to combat it. The book was well-received upon its release and was adapted into a film in 1994, starring Harrison Ford as Jack Ryan. It remains one of Clancy's most popular and influential works in the genre of military and espionage fiction.