When a young Los Angeles police department Special Weapons and Tactics (S.W.A.T.) officer named Jack Traven enrages retired Atlanta police department bomb squad member Howard Payne by foiling his attempt to take hostages trapped in an elevator with a bomb, Payne retaliates by arming a bus with a bomb that will explode if the bus slows down below 50 miles per hour. Jack and his partner Detective Harry Temple strive to save the people on the bus before the bomb goes off with the help of spunky passenger Annie, while also trying to figure out how Payne is monitoring them.
