“Drive to the Inanity,” said the detective as he got into the cab; and when the man stopped before the theatre: “Do you know Carolina Road, North West?” he asked him, leaning out of the window to do so.

“Yes,” the driver said. “The other side of Regent’s Park, isn’t it?”

“Then go there.” Gimblet drew his head back and sat down as the man let in the clutch and the taxi started again. It was almost seven o’clock and the roads were comparatively clear of traffic, while the pavement seemed still more deserted, the few people who were to be seen walking quickly to get out of the rain; but it appeared that for the most part the world was within doors, resting after the day’s work, or preparing for the entertainments of the evening.

The taxi went swiftly, and in a short time had drawn near to its destination. As they left the more fashionable streets behind and passed northward into semi-suburban districts, Gimblet leant eagerly forward, noting every characteristic of the neighbourhood with an observant eye and an expectant alertness.

They soon came upon tree-lined roadways, bordered by houses that boasted small plots of ground before their doors. Railings enclosed these plots, and in many cases a minute carriage drive circled from the pavement to the entrance of the house; but as they turned corner after corner and the same scene, with slight variations, continually repeated itself, Gimblet’s hopes gave way to an incredulous disappointment, for of all these dwellings not one answered to the description given by Miss Finner. She had mentioned particularly that the house he was looking for stood alone in its little garden; but in all the streets traversed by the detective not so much as a cottage was to be seen of the kind known technically as “detached.”

They turned at length into Carolina Road and the driver slowed up, looking round as he did so for instructions.

Again Gimblet’s head went out of the window.

“Go back towards the theatre,” he said, “but go another way,” and after much noise and backing—for the street was a narrow one—the cab turned, and off they started again.

Rain was falling heavily by this time in a cold, persistent downpour. The wind blew chill from the west, and the detective, all a-shiver on this summer’s evening, told himself, as he drew up the windward pane, that there must be icebergs sailing down the North Atlantic. He wrapped his coat closer around him, and hugged himself in a corner of the taxi. Again they splashed and bumped over the muddy, streaming macadam; the water swished from the wheels; the driver cowered under his shining waterproof screen; and the car skidded unpleasantly as they swung round corners and narrowly avoided collision with other vehicles in the same plight.

Gimblet kept a look-out no less sharp than before, but with no better result. Here were houses, indeed, in plenty, here were gardens and carriage gates, and dripping trees; but here was no single detached building of any shape or kind whatsoever. Another drive Gimblet took, following devious ways. He felt inclined to ring at Miss Finner’s door and reproach her with inaccuracy; but she had not told him the number in Carolina Road of the house she lived in. Besides, at this hour she would be at the theatre preparing to remove the apple which young Tell was undauntedly balancing.