"Plenty of spikes and glass-bottle stuff on those walls, anyhow!" remarked Ayscough, as they went round a narrow alley to the rear of the villa. "Your grandfather evidently didn't intend anybody to get into these premises very easily, Mr. Rubinstein. Six-foot walls and what you might call regular fortifications on top of 'em! What are you going to do, now?"

Melky had entered a recess in the side-wall and was examining a stout door on which, plainly seen in the moonlight, were the words Tradesman's Entrance. He turned the handle—and uttered an exclamation.

"Open!" he said. "Come on, Mr. Ayscough—we're a-going in! If there is anybody at home, all right—if there ain't, well, still all right. I'm going to have a look round."

The detective followed Melky into a paved yard at the back of the villa. All was very still there—and the windows were dark.

"No lights, back or front," remarked Ayscough. "Can't be anybody in. And I say—if either of those Chinese gents was to let himself in with his key at the front gate and find us prowling about, it wouldn't look very well, would it, now? Why not call again—in broad daylight?"

"Shucks!" said Melky. "Ain't I one o' the landlords of this desirable bit o' property? And didn't we find that door open? Come round to the front."

He set off along a gravelled path which ran round the side of the house, and ascended the steps to the porticoed front door. And there he rang the bell—and he and his companion heard its loud ringing inside the house. But no answer came—and the whole place seemed darker and stiller than before.

"Of course there's nobody in!" muttered Ayscough. "Come on—let's get out of it."

Melky made no answer. He walked down the steps, and across the lawn beneath the iron-work gate in the street wall. A thick shrubbery of holly and laurel bushes stood on his right—and as he passed it something darted out—something alive and alert and sinuous—and went scudding away across the lawn.

"Good Lord!" said Ayscough. "A rat! And as big as a rabbit!"