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This patchwork Argentine film is two-thirds of a trilogy originally called Obras Maestras del Terror, made in 1960 but released in the U.S. in 1965. The segment entitled "The Tell-Tale Heart" was expanded and new footage was shot for American release (in 1972). The plot involves a man named Pierre who is thrown into a foul, rat-filled dungeon with a bearded old prisoner called Sydney. The two of them escape, and Pierre meets up with his old girlfriend. Meanwhile, crazed Sydney starts murdering people. The new footage, for some reason, features clips from old Roger Corman films, the soundtrack from The Astounding She Monster, and flashbacks that tell how Sydney went to work for his creepy, nasty, one-eyed old uncle in a shop filled with loud clocks.