In Singapore, a private detective and the British authorities are on the trail of a crime syndicate that kidnaps a nuclear physicist with the aim of selling him to the highest bidder.
Gerald Meek and Myrna McAllister go to city hall to apply for a marriage license. Gerald wanders into the Marine Recruiting office by mistake and Sergeant Delaney signs him into the Marine Corps and sends him for a medical examination before Gerald realizes what has happened. He finds himself in uniform and ready to be shipped to boot camp without any delay, other than explain to his intended-bride that Uncle Sam has other plans for him.
As a boy, Shamrock's parents were killed. He took possession of a pistol belonging to his father, a famous marshal. Now that he is grown, he takes the job of marshal and uses the same gun, but he still has to solve the mystery of what happened to his parents.
Little Larry Havens, whose father died in WWII, runs away from home to keep from being separated from "Shep," his father's dog. In Arizona, he is befriended by a kindly Mexican, Manuel Ortiz, who he is able to repay in time, with the aid of Sheriff "Cap" Weatherby, when Ortiz is suspected of crimes committed by local gangsters. "Shep" is instrumental in saving Ortiz from a lynching, and Larry, "Shep" and Ortiz all find a home with a couple they have befriended.
Rick Mason is the no-good lowdown rat who tries to capitalize on postwar patriotism and grief. He finagles a war widow into giving up her savings for a nonexistent memorial. When Mason falls in love with the widow he has pangs of conscience, but he reckons without his con-artist boss, who tends to bolster his arguments with muscle and bullets.
In 17th-century England, Charles II, the rightful heir to the kingdom, is driven from his country by militants working for rogue leader Oliver Cromwell. Charles ends up in the Netherlands, where he falls for local beauty Katie and spends his days happily in the quiet countryside. Unfortunately, Cromwell's associate Col. Ingram and his men track Charles down, and the would-be monarch must resort to swashbuckling his way to freedom.
When Ivy, an Edwardian belle, begins to like Miles, a wealthy gentleman, she is unsure of what to do with her husband, Jervis, or her lover, Dr. Roger. She then hatches a plan to get rid of them both.
While packing her belongings in preparation of evacuating the White House because of the impending British invasion of Washington D.C., Dolly Payne Madison thinks back on her childhood, her first marriage, and later romances with two very different politicians, Aaron Burr and his good friend James Madison. She plays each against the other, not only for romantic reasons, but also to influence the shaping of the young country. By manipulating Burr's affections, she helps Thomas Jefferson win the presidency, and eventually she becomes First Lady of the land herself.