A young American arrives in Valdonia to collect a debt which the kingdom owes to his millionaire father. He impersonates a Valdonian prince for a day and wins the love of Princess Iris, the queen of the kingdom.
Fired from his job for shirking his duties, the 'Knight of the Plains' Bart Miller stumbles across a would-be stagecoach robbery and he rescues damsel in distress Betty Taylor. He takes Betty and her pretty girlfriends to the ranch of her father Bill Taylor. Meanwhile Taylor's foreman Luke Hatton is plotting to rustle his boss' herd with the aid of the corrupt lawyer Harkness.
Struggling stockbroker Jimmie Shannon learns that, if he gets married by 7 p.m. on his 27th birthday -- which is today -- he'll inherit $7 million from an eccentric relative.
Cowhand John Marvin, in a cattlemen-vs-sheep-men range war, comes to the aid of a pretty and defenseless young sheepherder, Kate Bowers. This angers the other cattlemen, especially Palque Powell, who employs deceptive methods against Kate, while pretending to help her.
Director Bernard J. Durning's silent seafaring romantic melodrama