Another Plan
Robert was far from tranquil when he waited in the lobby for almost an
hour after the performance had begun. Disgruntled, he quit the site of his vigil. He had to face the fact that he was making no progress. Tomorrow he would
telephone several women's residences. It was a cumbersome way of going about for
hunt, but that is what he could think of at the moment. He would interrogate
the desk clerks, and perhaps he might uncover a pertinent clue to Evelyn's 
whereabouts. If he could only get someone to divulge he hiding place! 
Tomorrow would culminate in success.

to take a leaf out of someone's book--to imitate or follow the example.
the chip off the old block took a leaf from his father's book and
never sowed wild oats.