France, 1803: 11 years after the Revolution, a royalist underground is led by a new 'Scarlet Pimpernel', the Purple Mask, who rescues nobles in distress and kidnaps Napoleon's officials for ransom, aided by the spy services of a group of lovely models headed by Laurette (really the Duc de Latour's daughter). But even she doesn't know the Purple Mask's real identity as foppish dancing master Rene...
The sheriff of Gunlock is planning to hang Sam Hall, who shot three farmers found on cattle land, at sundown. At the casino, betting is 8 to 3 he won't make it. The cattlemen are set to rescue Sam; the farmers hope to lynch him before he can be rescued; and Hall schemes for escape with his girl Nellie. But Sheriff Jorden is most concerned with finding out who hired Hall: a leading suspect is the sheriff's future brother-in-law.
A lone-wolf scientist sequestered in a mansion near a small desert town arouses the suspicion of the town's doctor when his lab assistant is found dead from a case of acromegaly which took only four days to develop. As the doctor investigates, aided by the scientist's new, and very female, assistant, they discover that, far worse, something much larger and hungrier than it ever should be, is devouring local cattle - and humans - in increasingly large quantities.
In the U. S. Army intelligence office, bumbling lieutenant Peter Stirling receives a coded message from his friend, Francis, a talking mule. The note urges Pete to hurry to the Coronado, California naval base, where Francis is about to be sold as surplus. Pete rushes to the train station, but before he can board, nurse Betsy Donevan mistakes him for her shell-shocked brother, Navy boatswain Slicker Donevan. She tries to forcibly remove his uniform so he will not get into trouble for impersonating an Army officer. Finally she realizes that Pete is not Slicker but merely his mirror image.
In present-day U.S., Dr. Michael Parker, a prominent surgeon, unexpectedly runs into his German-born wife whom he thought was dead. Victor, an artist and his "dead" wife's now boyfriend, berates Dr. Parker for "killing" her. The bulk of the story flashes back to Austria during World War II as we learn how Dr. Parker met and married his wife, and the one mistake that may have cost him his family.