John and his class go on a school trip to the Tower of London. While he is there he loses his pet mouse and vows to return and find her later. Back in school, he is not very attentive and falls asleep during a lesson about electricity so his teacher sends him home. On the 'tube' there is a sudden flash, and John, the train and all of the passengers turn yellow. With the help of Nick (short for 'Electronic') John learns about electricity, invades the Tower of London and saves his pet mouse ... or was it a dream. This is the Powell & Pressburger touch applied to children's films.
Dick Vernon (Montagu Love) lives in New York but hasn't succumbed to the city's vices. When his vacation comes up, he goes to Boonsburg to visit his uncle (George Bunny) and aunts (Emily Fitzroy and Annie Laurie Spence). He finds small-town life far more wicked than living in the big city. A theatrical troupe comes to town, and Dick finds his match in chorus girl Mazie Chateaux (Helen Weir). Dick's uncle inherits a huge sum of money and insists that his nephew take him to New York and entertain him. Dick, knowing what his uncle expects, takes him through a number of wild adventures, but he is happy to put all that behind him and settle down with Mazie. (Janiss Garza)
A notorious gambler and card cheat, George Forrester, rules a little western town with an iron hand. The men of the town plot to catch him cheating and do, but his men save him from danger. In the same town lives Gerald Austen, or Aitkens, who had left his tyrannical father in the east and made good in the west.
A rich contractor sends his son to supervise the building of a new dam. His clothes are stolen by a tramp and dressed in the tramp's clothes he's mistaken for a laborer.
Edward Thursfield, chief engineer of the bridge building firm of Henry Killick and Company, is building the largest concrete bridge in the world. Employed in the New York office is a young man named Arnold Faringay. Arnold sees an opportunity of using money from the payroll for a big deal.