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"Danse Diabolique" is the title of a "cursed" ballet, which has been performed only three times. On the first two occasions, the prima ballerina has died under mysterious circumstances--and the same thing happens to the unfortunate young lady who stars in the third performance. Suspecting that murder rather than superstition is the cause of these three deaths, Jessica (Angela Lansbury) investigates, at one point posing as a scatterbrained Southern matron in order to weed out some vital information about some significant roses.