The girls finally get a job in California in the gift wrapping department at Bardwell's Department Store. On their first day on the job, Laverne gets tipsy after eating candy laced with alcohol.

Disappointed after not receiving the customary tri-monthly $5.00 raise, Laverne and Shirley write a nasty letter to their boss. At the end of the day, it is revealed that they DID get a raise, after all, but also that the nasty letter is sitting, unopened, on the boss's desk - waiting to be read the next morning. Desperate to save their jobs, Laverne and Shirley go home and try to hatch a plan to get that letter back, before morning.

The girls recruit Lenny, Squiggy, and Carmine to help them pull off this mission. Lenny and Squiggy will drive the getaway car, and act as lookouts, while Carmine, Laverne, and Shirley will sneak through the air vents, and make their way into the boss's office. They will carefully maneuver around the alarm system, retrieve the letter, and be on their way. No one shall be the wiser.

Of course, when they try to put the plan into action, our heroes run into some obstacles along the way, and quickly realize that this isn't going to be as easy as they thought.