Pirates take over a lighthouse on a rocky island. They then execute a devious plan to cause ships to run aground, pillaging their wrecks. A lone member of the lighthouse crew survives, and he deperately fights their plot. A shipwrecked maiden that avoids the pirates slaughter soon complicates the situation.

When Madame Adelaide Bonfamille leaves her fortune to Duchess and her children—Bonfamille’s beloved family of cats—the butler plots to steal the money and kidnaps the legatees, leaving them out on a country road. All seems lost until the wily Thomas O’Malley Cat and his jazz-playing alley cats come to the aristocats’ rescue.