Ahmed and Salahadin left Pearson's room and went down stairs. They sat down and the manager brought them some coffee. How can we find the seventh box?asked Ahmed. I need your help, replied Salahadin. How can I help you? asked Ahmed. The murderer took the box with him.Said Salahadin. It was heavy and it's hot today. The murderer did not carry the box very far. Perhaps he took a taxi. Perhaps he had his own car, said Ahmed. We don't know, replied Salahadin. But, perhaps he took a taxi. That's possible, agreed Ahmed. And you want to find that taxi. But, how can I help you? You can send out a police message on Radio Cairo, replied Salahadin. That's true, agreed Ahmed. What shall I say in the message? When did Pearson die?asked Salahadin. About half past ten this morning, replied Ahmed. Then here's the message,said Salahadin. The police want to speak to a taxi driver. This taxi driver was near the Nile Hotel at about eleven o'clock this morning. A man got into his taxi .