Behind the curtain

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in concealment; in secret.

See also: Curtain

References in classic literature ?
And all went well, and no one in the audience would have suspected the full stage of dogs behind the curtain had not Dick and Daisy, accompanied by the orchestra, begun to sing "Roll Me Down to Rio.
His hands were gripping the arms of the stall, his eyes were fixed upon the spot somewhere behind the curtain where this sudden little drama had been played out, as though indeed they could pierce the heavy upholstery and see beyond into the room where the very air seemed quivering still with the vehemence of the woman's outpoured scorn.
That made it all right; and when he set her down, Rose's face was so bright it was evident that some spell had been used to banish the feeling of neglect that had kept her moping behind the curtain so long.
This thought hath been carried so far, and is become so general, that some words proper to the theatre, and which were at first metaphorically applied to the world, are now indiscriminately and literally spoken of both; thus stage and scene are by common use grown as familiar to us, when we speak of life in general, as when we confine ourselves to dramatic performances: and when transactions behind the curtain are mentioned, St James's is more likely to occur to our thoughts than Drury-lane.
A fresh young voice answered from behind the curtain which closed the further end of the corridor, "No better, my Lady.
LADY WINDERMERE slips out from behind the curtain and glides from the room L.
There was a movement in the box, and a woman's head and shoulders appeared from behind the curtain.
She thought she recognised the figure of Lady Arabella, and instinctively drew back behind the curtain.
Come, come," thought D'Artagnan, emerging from behind the curtain, "decidedly Monsieur Planchet is no fool; it is evident he has been brought up in a good school.
Then I see my prince, who is young, handsome, and brave, who has courage in his heart, and lightning in his eye, -- I see him tremble before a priest, who laughs at him behind the curtain of his alcove, where he digests all the gold of France, which he afterwards stuffs into secret coffers.
There was a good deal of rustling and whispering behind the curtain, a trifle of lamp smoke, and an occasional giggle from Amy, who was apt to get hysterical in the excitement of the moment.
There is a curtain more dust-coloured than red, which divides it, and the part behind the curtain makes the private sitting-room.