Dagwood Bumstead, an absentminded and clumsy draftsman with Dithers Construction Co., accidentally destroys the car and garage belonging to his new neighbor, attorney Conroy. When Conroy threatens to sue Dagwood for hundreds of dollars, Dagwood's wife Blondie urges her husband to ask his boss, J. C. Dithers, for a bonus. Dithers, however, refuses Dagwood's request, and reminds him that he must make a good impression on Charles Peabody, a prospective client he is to meet the following day. Dithers hopes that a deal with Peabody will save the company from bankruptcy, and insists that Dagwood take his meeting with Peabody seriously. The following day, Dithers, while attempting to park his car in front of his office, collides with the car behind his. A police officer breaks up the ensuing quarrel between the two men, and it is not until Dithers arrives in his office that he discovers that the man he called a "half-wit" is Peabody. In the hopes of preventing the Peabody deal from falling through, Dithers has Dagwood temporarily assume his identity and oversee the business negotiations himself. The scheme works all too well when Peabody insists that the real Dithers, who is introduced to him as Dagwood, be fired. Delighted to see Dithers fired, Peabody invites Dagwood to join him for an evening of entertainment at a nightclub, and asks him to find two female companions for them. At the Hi-Ho nightclub, Dagwood and Peabody meet David Armstrong, another prospective client of the Dithers Construction Company. Meanwhile, Dithers accidentally reveals to Blondie that Peabody and her husband are at the Hi-Ho club, and she insists that they go there to spy on them. Blondie is angered tp see her husband romancing his date, but when she approaches Dagwood's table, she decides to play along with the ruse, and begins charming Peabody. When Dagwood inadvertently reveals his imposture by calling Dithers by his real name, Peabody cancels his business plans and vows to sink Dithers' company. Fired from his job, Dagwood spends his days in a park, avoiding Jim Gray, the process server that Conroy has hired to present Dagwood with a summons. A short time later, when Armstrong, who is interested in making a business deal with the construction company, asks to meet with the company head whom he met at the nightclub, Dithers, Blondie and Armstrong set out in search of Dagwood. Dagwood, in the meantime, has become entangled in another misadventure after volunteering to test a truth serum at the Titus Research Foundation. No sooner do Dithers, Blondie and Armstrong find Dagwood than he, under the influence of the serum, reveals his true identity to Armstrong. Angered by the deception, Armstrong cancels his business deal. Dagwood, however, convinces Armstrong that the Dithers Construction Co. is the best in town, and Armstrong gives Dithers his business. Having saved Dithers' construction company from bankruptcy, Dagwood is rewarded with a bonus.