Professor Bruce Patterson is constantly having to fight off the advances of his young female students and is engaged to Helen Bushmill. While Helen goes on vacation, Bruce decides to stay at her apartment but is surprised by the arrival of Libby, Helen's 17-year-old daughter. Having never been told by Helen of this daughter, Bruce assumes she's another student. During her stay, Libby is noticed by an amorous neighbor, Mike.

Norman Phiffer, a proud man in a humble life, doesn't know that his girlfriend, Barbara, is heir to the Tuttle Department Store dynasty. Mrs. Tuttle, Barbara's mother, is determined to split the two lovers, and hires Norman in an attempt to humiliate him enough that Barbara leaves him. Will she ruin their love, or will he ruin her store?