Glancing at Cho-San, he saw that the Scorpion leader was studying a small pocket mirror, cupped in one of his huge hands. The mirror was held so as to reflect everything that could be seen through the car’s rear window.

Suddenly with an angry snort, the big Chinese bent forward.

Yi kow pu hau-tung sai-kai!” he cried sharply.

Ta hau,” came the driver’s answering sing-song, “kia hing.”

With a jerk the car speeded up, throwing the passengers back against the cushions. Don felt Lotus’ small, cool hand close down on his finger.

“It’s that car following us, André,” she explained. “Cho-San has just told Ko Loo, the chauffeur, to speed up and lose it.”

Don twisted to look through the rear window at the criss-crossing traffic of an intersection. With a short laugh he turned back.

“Cho-San knows best,” he remarked lightly. “I couldn’t tell if one of those pairs of lights back there were following us. It looks to me as if they all are. But what’s the difference?”

“None, my dear Borg,” rumbled Cho-San, “considering that Ko Loo has never yet failed to put an enemy off the trail. As a matter of fact, two sets of lights are following us at this moment. The trailer is being trailed by one of our own cars. He will have an unpleasant surprise, in addition to losing track of us!”

Sharp anxiety shot through Don’s mind. “An unpleasant surprise” might mean anything from a car accident to murder. And Red Pennington was the trailer who was going to get it!