Behind the Bronze Door by William Le Queux

When Yootha awoke next morning, her head was aching badly. She had only a confused recollection of the events of the previous night, and the more she tried to remember exactly what had happened, the greater the tangle became.

Her blinds were down and the room was still almost in darkness, as she had not yet been called. For about an hour she remained in a sort of disturbed half-sleep; then gradually she began to wonder what the time could be. Through the open windows the sound of traffic came to her, which made her think it must be late. She turned to look at her watch. It had stopped at four in the morning.