John Dobbie

George is a disaster-prone zoo attendant who accidentally discovers a substance that accelerates motion, enabling his greyhound to run faster. This attracts the interest of a gang of criminals, who kidnap George's dog and plan to substitute their own in an important dog race. George and his friends defeat the crooks and their dog wins the race.

George enlists in the police force and is assigned to Harmony Row, a haunt of criminals such as Slogger Lee.

After her father's death, socialite Elaine Fleetwood promises to marry a man she does not love. However, she leaves him at the altar during a wedding ceremony, cuts her hair and decides to disguise herself as a boy and go prospecting in northwest Tasmania. She meets a handsome miner who figures out she is a woman, saves her from a villain and marries her.