CHAPTER ONE

      There was no mail for me that morning, but that was no surprise. There had been no mail for me in the three weeks I’d been renting that tiny second-floor suite of offices near Oxford Street. I closed the door of the outer eight by ten office, skirted the table and chair that might one day house a receptionist if the time ever came that Cavell Investigations could run to such glamorous extras, and pushed open the door marked “Private.”

      Behind that door lay the office of the head of Cavell Investigations, Pierre Cavell. Me. And not only the head but the entire staff. It was a bigger room than the reception office, I knew that because I’d measured it, but only a trained surveyor could have told it with the naked eye.

      I’m no sybarite, but I had to admit that it was a pretty bleak sort of place. The distempered walls were of that delicate tint of off-grey pastel shading from off-white at floor level to off-black just below the ceiling that only London fog and the neglect of years can achieve. In one wall, overlooking a narrow grimy courtyard, was a tall narrow window, washed on the inside, with a monthly calendar close by. On the linoleum-covered floor a square desk, not new, a swivel chair for me, a padded leather armchair for the client, a strip of threadbare carpet to keep the client’s feet from getting cold, a hatrack and a couple of green metal filing cabinets, both empty. Nothing more. There was no room for anything more.

      I was just lowering myself into the swivel chair when I heard the deep double chime of the bell in the reception-room and the sound of hinges creaking. “Ring and enter” the legend on the corridor door read and someone was doing just that. Ringing and entering. I opened the top left-hand drawer of my desk, pulled out some papers and envelopes, scattered them before me, pulled a switch by my knee and had just risen to my feet when the knock came at my inner door.

      The man who entered was tall, thin and a close student of the Tailor and Cutter. A narrow-lapelled coat hung over an immaculately cut charcoal suit in the latest Italian line, and in his suéde-gloved left hand he carried his other glove, black bowler, briefcase and, a few inches up his wrist, a tightly-rolled, horn-handled black umbrella. He had a long pale narrow face, thin black hair parted in the middle and brushed almost straight back, rimless glasses, an aquiline nose and on the upper lip a thin black line that, on closer inspection, still looked like a thin black line, miniaturisation of the moustache brought to an almost impossible state of perfection. He must have carried a micrometer about with him. He looked for all the world like a top-flight City accountant: I couldn’t see him as anything else.

      “Excuse my walking straight in like this.” He smiled briefly, three gold caps in the upper teeth, and half-glanced over his shoulder. “But it seems your secretary——”

      “That’s all right. Please come in.” He even talked like an accountant, controlled, positive, slightly over-precise in the articulation. He offered me his hand, and the hand-shake, too, was in character, quick, neat, giving nothing away.

      “Martin,” he introduced himself. “Henry Martin. Mr. Pierre Cavell?”

      “Yes. Won’t you sit down, Mr. Martin?”

      “Thank you.” He sat down gingerly, very straight, feet together, brief-case balanced with scrupulous care across his touching knees and looked around him slowly, missing nothing, a faint smile not showing his teeth. “Business not—ah—so very brisk these days, Mr. Cavell?”

      Maybe he wasn’t an accountant after all. Accountants, as a rule, are polite, well-mannered and slow to give unnecessary offence. But then maybe he wasn’t feeling quite himself. People who came to see private detectives were seldom in a normal frame of mind.

      “I keep it this way to fool the Inspector