"He came last Monday afternoon—three days ago," my man replied.
"Anything else?"
"Well, sir, I managed to make friends with the maidservant, and then, on pretence of wanting apartments myself, got her to show me several rooms in the house in the absence of her mistress. Doctor Arendt was out, too, therefore I took the opportunity of looking around his bedroom. I'd given the girl a sovereign, so she didn't make any objection to my prying about a bit. Arendt is a rather suspicious character, isn't he, sir?" asked Rayner, looking at me curiously.
"That's for you to find out," I replied.
"Well, sir, I have found out," was his quick answer. "In the small top left-hand drawer of the chest of drawers in his room I found a small false moustache and some grease-paint; while in the right-hand drawer was a Browning revolver in a brown leather case, a bottle of strong ammonia, and a small steel tube, about an inch across, with an india-rubber bulb attached to one end."
"Ah!" I said. "I thought as much. You know what the ammonia and rubber ball are for, eh?"
The man grinned.
"Well, sir, I can guess," was his reply. "It's for blinding dogs—eh?"
"Exactly. We must keep a sharp eye upon that Belgian, Rayner."
"Yes, sir. I took the opportunity to have a chat with the maid about the recent affair on the East Cliff, and she told me she believed that the dead man and Doctor Arendt were friends."