Le vicessitudini di tre coppie di novelli sposi dalla celebrazione dei matrimoni sino ai rispettivi viaggi di nozze.
Grant Jordan, bachelor botany professor, marries Katie, a widow with three kids, despite the machinations of Grant's former girlfriend Minna. But on the wedding day, Aunt Jo, who was to babysit, breaks a leg; so the kids come along on the honeymoon.
Newlyweds Webster and Jackie Frye spend their honeymoon in a sinister old country house. Before long, they are besieged by a gang of crooks, searching for a fortune in diamonds. With the help of chauffeur Harmony Jones, the honeymooners attempt to outsmart the villains.