Female agent disguises herself as a harpist performing on stage at nightclub & with the help of her henchman switches places with the harpist while she's still on stage! The female agent then uses the harp like a bow & tries to shoot Flint (James Coburn) with a tiny poison tipped arrow.
Oh yeah, please don't PM me asking what became of the real harpist. She isn't mentioned or show in the movie after she disappears behing the curtain.