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Cyril Sneer holds a conference at Sneer Mansion, intending to make a film based around the legendary Prism of Zenda, which is owned by Lady Boden-Boden and Mr Knox. However, during the presentation, the lights go out, and the prism disappears when the lights come back on!
In order to save face, the pigs claim that the prism is hidden in the mansion, and that whoever finds it will win a role in Cyril's film.
While numerous persons turn the mansion inside out, Cyril tries to stall for time to keep from telling Lady Boden-boden and Mr Knox that he really has lost it.
Eventually, the pigs supply a fake prism, but Cyril is still upset that he hasn't been able to find the real one, until Bert Raccoon reveals that it was knocked into a fishtank on the stage.
Cyril and the pigs then attempt to sneak back into Knox's mansion and return the Prism, but set off the alarm. It turns out that Knox gave Cyril a fake, and Cyril and the pigs are arrested for trespassing.