SpongeBob is told that there will be a Princess Napkins delivery today, and to tell Mr. Krabs. SpongeBob thinks Princess Neptuna is coming, and a whole setup is prepared, only to have to be ruined. Luckily, Princess Neptuna comes in the end, and all goes well.
The book starts out with SpongeBob talking to Mr. Krabs. A truck parks outside of The Krusty Krab and Mr. Krabs tells SpongeBob to go and investigate. After finishing mopping the floor, he does so. From the sound of the loud, beeping truck, SpongeBob cannot hear the truck driver talking. The driver tells SpongeBob to tell Mr. Krabs that Princess Napkins will be brought to the Krusty Krab, but SpongeBob thinks he's saying Princess Neptuna. After telling Squidward the news, he becomes anxious and crazy. He tells SpongeBob not to tell Mr. Krabs because Squidward doesn't want customers there when The Princess comes. When they are getting ready and prepared, Mr. Krabs overhears them talking. He puts flyers up everywhere. When only napkins come that day, SpongeBob dresses up as Princess Neptuna, but not in a realistic manner. They almost instantly find out that's not her. After many tomatoes thrown and lots of booing, the real Princess Neptuna goes to The Krusty Krab. She eats there, and all goes well. In the end, The Princess feeds a Krabby Patty to SpongeBob. The next page is a Mr. Krab's Secret Message Puzzle.