“That’s a merry little party,” said Dick.

“Very,” replied Elk laconically.

A few seconds later, a second car flashed past, going much faster than they.

“That looks to me like one of your police cars,” said Dick.

This, too, was crowded.

“It certainly looks like one of my police cars,” agreed Elk. “In America they’ve got a better stunt. As you probably know, they’ve a fine patrol wagon system. I’d like to introduce it into this country; it’s very handy.”

As the car slowed to pass through the narrow, crooked street of Colnebrook, a third of the big machines squeezed past, and this time there was no mistaking its character. The man who sat with the driver, Dick knew as a detective inspector. He winked at Elk as he passed, and Elk winked back with great solemnity.

“What is the idea?” asked Dick, his curiosity now thoroughly piqued.

“We’re having a smoking concert,” said Elk, “to celebrate Balder’s promotion. And it will be one of the greatest successes that we’ve had in the history of the Force. There will be the brothers Mick and Mac, the trick cyclists, in their unrivalled act . . .” He babbled on foolishly.

At Langley the fourth and fifth police cars came past. Dick had long since realized that the slow pace at which his own car was moving was designed to allow these laden machines to overtake them. Beyond Langley, the Windsor road turned abruptly to the left, and, leaning over the driver, Elk gave new instructions. There was no sign of the police cars: they had apparently gone on to Slough. A solitary country policeman stood at the cross-roads and watched them as they disappeared in the dusk with a certain languid interest.