This film would have probably been horrible had they taken themselves seriously. Fortunately, they didn't and, consequently, created a fascinating and entertaining festival of murder, revenge, and Art Deco set design. Vincent Price is Phibes, a brilliant organist and acoustic expert who's wife dies during an operation. He seeks to avenge her death by killing all 9 members of the operating team in creative and extravagant ways. You know the murders will take place, but you're fascinated at how they are done. It's like watching a master at work and all of the murders are works of art. By the end of the movie you'll find yourself rooting for Phibes.
Price is at his best at Phibes. Phibes requires a machine to speak, so Price is effectively miming to the dialog, but he does it so well. The performance of Virginia North as the silent, yet deadly, Vulnavia is particularly interesting. She plays the murderer's sidekick and is always beautiful and mysterious.
One of the most wonderful elements of this film is the Art Deco set and costume design. Every scene just oozes with elegance.
This is one of my favorite movies of all time. No, it's not Gone With the Wind, but it's fun and fascinating just the same, sort of a candy movie. I highly recommend it.