Click for larger image

Sam Bissell, a minor account executive in a San Francisco advertising agency, lives an uncomplicated suburban life with his wife, Min, and their two daughters.  His wholesome approach gains him the company's top account, Nurdlinger Eggs, but his troubles begin when Janet Lagerof, Min's best friend, rents the house next door.  Recently separated from her husband Howard, Janet learns that she stands to inherit $15 million from her grandfather if he believes that she is happily married.  Two cousins who are second in line for the money arrive to visit, and Janet introduces Sam as her husband.

The suspicious cousins hire Shiffner, a detective, to watch Janet.  Sam is forced to sneak back and forth between his house and Janet's, where supposedly he is sleeping.  Janet and Sam are secretly photographed together by an advertising man one day, and Janet is introduced to Mr.  Nurdlinger as Sam's wife.

Later, Howard arrives to attempt a reconciliation with Janet, but he is forced to pose as Min's husband.  Although Howard loves Janet, she believes that he is only after her inheritance.  Jealousy soon provokes friction among the four.  The will is finally settled in Janet's favor, but the harried Sam has failed to check the picture of the couple to be used on the Nurdlinger billboards.  The picture, a pose of himself with Janet, is captioned "Mr. and Mrs. Sam Bissell."  Because Janet will lose the inheritance if she is recognized on the billboards, she and Sam stay up all night painting over their pictures on the advertisement.

Min later sees a message for her that Sam has painted on one of the billboards, and they are reconciled, as are Janet and Howard; and Janet gets her inheritance.