Ham Sandwich

There was no one standing or sitting around the tastefully furnished entry hall of the Institute of Insight when Wallace Cavender walked into it. He was almost half an hour late for the regular Sunday night meeting of advanced students; and even Mavis Greenfield, Dr. Ormond's secretary, who always stayed for a while at her desk in the hall to sign in the stragglers, had disappeared. However, she had left the attendance book lying open on the desk with a pen placed invitingly beside it.