The Hogans take a trip to Paris and enjoy the sites and sounds. Meanwhile, David befriends an attractive woman, Julia, who unknowingly to him is a princess playing hooky from her royal duties. However, private investigators soon begin searching for her.

Paris, the City of Lights, has cast a romantic glow over David and Julia, however, Julia's day of playing hooky begins to slowly come to an end as the private investigators stake out the Hogan family. Sandy and Mrs. Poole quickly find themselves in trouble as they are chases through Paris by two men.

The private investigators catch up to Julia and whisk her away leaving David without an explanation or a goodbye. However, things turn around for the young couple as, Julia invites him and his family to a Parisian party fit for a princess.