Author Tom Clancy introduced the character of Jack Ryan in a series of books before Ryan headed to the big screen in several films. Now the former U.S. Marine is featured in an episodic series for the first time, with John Krasinski portraying Ryan in this Amazon original thriller that centers on Ryan as an up-and-coming CIA analyst. He is thrust into a dangerous field assignment for the first time and uncovers a pattern in terrorist communication. That launches him into the middle of a dangerous gambit with a new breed of terrorism that threatens destruction on a global scale.