Without Remorse is a thriller novel by Tom Clancy that follows the story of John Clark, a former Navy SEAL, as he seeks revenge for the murder of his girlfriend and becomes embroiled in a covert operation involving drug cartels and the Vietnam War.

After the brutal murder of his girlfriend, John Clark embarks on a mission to track down her killers, leading him into a world of international intrigue and violence. His quest for justice takes him from the streets of America to the jungles of Vietnam, where he confronts both his enemies and his own demons.