A U. S. Marines dog is returned to his young owner in the small town of Monrovia at the end of WWII, but a grouchy neighbor believes the animal's military training makes him a threat to the community and files charges to have the dog destroyed.
Insurance salesman Paul is to be engaged with Louise, the daughter of his boss. Trying to sell insurance to a millionaire he meet the millionaire's daughter Annette whom he fall in love with after complications and funny business.
Alejandro is a young composer from Madrid who, overwhelmed by a sentimental and artistic failure, decides to enlist as a volunteer soldier and go to war-torn Cuba, where he befriends Antonio, who becomes his best friend.