When Herbert, Dobie and Maynard deliver some groceries to Osborne Manor, Dobie spies a beautiful young woman with who he falls in love at first sight. She is Alicia Osborne, Mrs. Osborne's niece. Remarkably, Alicia also falls love at first sight with Dobie. As Alicia's father has more power than Mrs. Osborne within the family, Alicia is able to invite Dobie and Maynard and Herbert to spend the weekend at the estate against Mrs. Osborne's wishes. However, Mrs. Osborne vows everlasting revenge on any of the three if anything goes wrong during their stay. Something does quickly go wrong as some of Mrs. Osborne's jewels go missing from her wall safe. She does not suspect either Dobie or Herbert, who she believes are too stupid to pull off such a heist, but rather Maynard. Dobie and Herbert also suspect Maynard as they have seen him sleepwalking in the middle of the night. Trying to stop his sleepwalking is impacting both Herbert and Dobie, the latter who just can't seem to find any time alone with Alicia. Regardless, Mrs. Osborne calls in the police. Herbert and Dobie try to hide Maynard's sleepwalking from the police while they try to find out what Maynard did with the jewels. Maynard does know more about the jewels' whereabouts than he lets on.
—Huggo