CHAPTER 11Macdonald put in some concentrated work before he left London again. He interviewed the club employees in the office, endeavoring to find out if any letter or telephone call had arrived for the professor on the Tuesday before he left. It emerged that Crewdon had been out nearly all Tuesday, and had not returned to the club until six o’clock in the evening. He had then had a few words with the secretary, but no one could recollect any letter or phone message coming for him. Professor Evans had come in at seven-thirty and the two men had dined together. At nine o’clock Crewdon had come to the office and asked for two trunk calls to be put through for him, one to Valehead, one to Cambridge. He had also left a message for the accounts department, saying that he would be leaving the c
