As Reginald swept her into the turn, face contorted in a rictus of merriment, he hissed a warning in her ear. “Keep dancing! For God’s sake, keep dancing! If they realize we’re released from their bizarre mind control, they’ll rend us limb from limb!”
Thanks to Josie Thames who suggested this pattern!
A Dress A Day 
There is a scene to this effect in John Buchan’s novel The Three Hostages (1924). One female hostage (having been hypnotised) is hidden in plain view as a nightclub dancer.
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Yes! I love it! Thank you so much–this is exactly what I’ve been needing today!
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I *knew* this one would be golden.
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This looks like a scene from a Hitchcock movie
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Fantastic!
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