Neddie Seagoon answers an advertisement to move a piano from one room to another for the sum of £5. However, he soon discovers that he has been tricked by Grytpype-Thynne and Moriarty, who want him to steal Napoleon's Piano from the Louvre in Paris and bring it to England for a quick resale. The story follows Seagoon's comedic and chaotic journey as he attempts to complete this absurd task.