
"You look so serious," she told him as they entered the hotel. "Am I such a responsibility?" Not yours, surely.
"Think about Paris. And let me know this evening. Will you?"
"But I must go on this trip, Bob. Because I´m curious."
He didn´t quite understand, looked at her questioningly as they waited at the desk for the key.
"Exactly half-past six," she said delightedly. "Bob, you´re wonderful. No, don´t come any further. Look at the crowd all around us, all speaking English. I won´t get lost." Suddenly, she reached up and kissed him gently. "Just wanted to. That´s all," she quoted.
He caught her hand. "Nina - because you´re curious? About what?"
"About Jim. If he isn´t in love with me, why does he pretend? Why so eager to have me along on this trip? I didn´t force myself on him, you know."
Yes, that´s right. The damsel in distress refuses to be saved, because Bob can´t tell her that she is in actual danger and why exactly she is in danger. On the other hand he isn´t smart enough to invent a little lie, for example that he fell head over heels in love with her, when they accidentally met in Amsterdam (it´s not exactly a lie in the overall plot of the book, but you know, it would have been a lie in that particular moment). I bet Nina would have stayed with him, would he have told her that.