half past nine
I fancy I can promise you some fun . '' Mrs. Gosnold ceased upon a note of mischievous enjoyment in anticipation that would have suited a girl of sixteen , then analysed the trouble behind Sally 's perturbed countenance . `` As for your costume , you 're not to give it a thought ! I have arranged for it to be brought to your room at half past nine , and I pledge you my word you 'll find it becoming . I have only two requests to make of you : that you refrain from unmasking or admitting your identity until one o'clock , and that if you recognise me , you hold your tongue . Is it a bargain ? '' `` You 're so good to me , '' said Sally simply , `` I ca n't think how to thank you . ''