"Just what do you think it is?" the officer asked.
"Well," Roger replied, "it's probably some organic compound that would react with the nitric acid to form an explosive nitrate. Of course, it could be an ammonium compound that would react to form ammonium nitrate. That would do the job just as well."
Three weeks later the agents were brought to trial for espionage and conspiracy to start a war. The whole story of the Arab plot came out. Following the lead of the North American Union, the South American Republic carried out an investigation of its own, and discovered the part the Arabs had played in various incidents on the southern continent.
Later that summer, the Gibraltar Conference met to settle grievances between the western powers and the League of Islam. King Ignatius II of the restored Spanish monarchy acted as a mediator. Reluctantly the North American Union agreed to let the Arabs build a spaceport in the Sahara, thus giving them a chance to trade directly with the Lunar colonies. On their part, the Arabs agreed to internationalize the Suez Canal area, on condition of free passage across the isthmus for Arab traffic between Egypt and Palestine. The Arabs refused flatly to allow a re-establishment of the Republic of Israel, but would allow Jews to settle in the Holy Land under yearly quotas. Despite reluctance and bitterness, a compromise was reached, and war was averted ... for the moment.
About a week after the trial Roger and Linda sat at a table in the large Spaceport Restaurant. Through the large window facing the rocket field, they could see clouds driven by an early March wind. Intermittent flurries of rain splashed against the glass. Roger happened to look up and see an elderly man approaching the table; his face lit up with recognition. "Well, Professor Nolan," he said, offering his hand, "I'm glad to see you."
"I'm glad to see that you got out of that trouble all right," Nolan replied as they shook hands.
"This is my wife, Linda," Roger said. "We're just about to order lunch. Won't you join us?"
"It would be a pleasure," replied Nolan as he sat down. "I'd like to hear about what happened to you."
Roger talked as he had punched their order into the robot server, and through most of the meal that arrived a few moments later.