Whoever Vannevan might be, Birrel thought, it was evident that these two hated and feared him like the devil.

Holmer gripped the wheel tighter, and the car suddenly lunged faster. He said, without turning, "You know what it means. The Irrians know now that we followed them to Earth. Hold on, we have to lose them!"

As by a lightning-flash, the shocking truth was abruptly revealed to Birrel. Two groups of secret agents, bitterly hostile to each other, playing a vast and deadly game against each other, were on the unsuspecting Earth!


CHAPTER IV

Birrel felt the imminence of onrushing danger. Danger, not just to himself, but to all his world. For in him lay the only chance to find out about the threat to Earth before it materialized.

Who their pursuers were, who the Irrians and Vannevan might be, and why they had come to Earth, he could not guess. But about Kara and Holmer, he was sure. Their colleague, the dead Rett, had had those pictures of Earth's most secret weapons and defenses on him. They, therefore, were the danger—and he must not lose them.

"Turn at the next side road!" he said to Holmer. "We can give them the slip in the back roads."

Holmer nodded. Birrel looked back. A pair of headlights swung steadily along a quarter-mile behind them.

"They're closer," said Kara.