"Without Remorse" is a novel by Tom Clancy that follows the story of John Clark, a former Navy SEAL. The plot centers around his quest for revenge after a tragic event involving his girlfriend, leading him into a world of covert operations and espionage. As Clark navigates this dangerous landscape, he becomes embroiled in a conflict that involves drug cartels and international intrigue. The book explores themes of justice, morality, and the consequences of violence, showcasing Clark's transformation into a skilled operative while grappling with his own sense of right and wrong.