Latimer turned to watch the subject of these reflections carefully, almost lovingly, adjusting the coffee percolator, and thought how difficult it wa… - Eric Ambler

It had been a most unpleasant day. [...] We had been questioned and cross-questioned. [...] The police couldn't have been worse. The questioner was a suspicious and bloody-minded Frenchman who made it clear from the start that he regarded us as undesirables. [...] My passport was received with a mocking smile. The bastard wouldn't take our word for anything. We had to show our money and count it out before his eyes. Then the amounts were written in our passports. We were warned against attempting to find work, unless it was in a ship leaving Djibouti, or to engage in the drug traffic. We were told, finally, that if either of us was still in the territory seven days hence, he had better be able to swim.

Hallett drew a deep breath. "Mr. Nilson," he said, "I wish you could tell me something. Why is it that when an apparently normal, intelligent, law-abiding citizen like you gets hold of a passport and a steamship ticket, he suddenly turns into a juvenile--"
"Okay, Mr. Hallett," Greg broke in irritably. "You can't say anything I haven't already said to myself."

I think that, to begin with, he had intended to kill Dimitrios when he found him, but as he began to get short of money his hatred of Dimitrios became more reasonable.